Fallback mode for wake-up signal receivers

ABSTRACT

Methods, systems, and devices for wireless communications are described. A wireless device, such as a user equipment (UE), may receive a configuration of a page monitoring periodicity, and a configuration of a wake-up signal from a network node, such as a base station. The UE may perform discontinuous monitoring for a plurality of wake-up signals based at least in part on a wake-up signal periodicity, and receive the wake-up signal on the wake-up signal periodicity. The UE may then monitor for paging messages to receive paging information, or updates to system information, during a page monitoring period according to the page monitoring periodicity, the wake-up signal periodicity, the received wake-up signal, or a combination thereof.

CROSS REFERENCES

The present Application for Patent claims benefit of U.S. ProvisionalPatent Application No. 62/585,478 by Liu et al., entitled “FALLBACK MODEFOR WAKE-UP SIGNAL RECEIVERS,” filed Nov. 13, 2017, assigned to theassignee hereof, and expressly incorporated by reference in itsentirety.

BACKGROUND

The following relates generally to wireless communication, and morespecifically to a fallback mode for wake-up signal (WUS) receivers.

Wireless communications systems are widely deployed to provide varioustypes of communication content such as voice, video, packet data,messaging, broadcast, and so on. These systems may be capable ofsupporting communication with multiple users by sharing the availablesystem resources (e.g., time, frequency, and power). Examples of suchmultiple-access systems include fourth generation (4G) systems such as aLong Term Evolution (LTE) systems or LTE-Advanced (LTE-A) systems, andfifth generation (5G) systems which may be referred to as New Radio (NR)systems. These systems may employ technologies such as code divisionmultiple access (CDMA), time division multiple access (TDMA), frequencydivision multiple access (FDMA), orthogonal frequency division multipleaccess (OFDMA), or discrete Fourier transform-spread-OFDM (DFT-S-OFDM).A wireless multiple-access communications system may include a number ofbase stations or network access nodes, each simultaneously supportingcommunication for multiple communication devices, which may be otherwiseknown as user equipment (UE).

In some wireless communications system, a base station may signal to aUE that data and/or system information is available by sending pagingmessages during paging occasions (POs). A UE may monitor a pagingoccasion, for example, in a particular subframe, to receive a pagingmessage and determine that paging information and/or system informationis available for the UE. In some cases, the base station and UE mayutilize a power saving signal, such as a WUS, for idle mode paging. Forexample, the UE may wake from a sleep state upon receiving the WUS andmonitor for downlink transmissions (such as a paging message) from thebase station. However, network errors or interference within the systemmay lead to missed WUS reception by the UE, which may result in faileddetection of paging messages that indicate important system informationchanges, thereby hampering UE performance.

SUMMARY

The described techniques relate to improved methods, systems, devices,or apparatuses that support a fallback mode for wake-up signal (WUS)receivers. In some cases, a base station may signal a change in systeminformation to a user equipment (UE) via a page or paging message. Thepaging message may carry an indication of a change in system informationand also indicate that paging information is available for one or moreUEs associated with the base station. A UE may periodically monitor forpaging messages transmitted from the base station during pagingoccasions (POs). A PO may be a transmission time interval (TTI) (such asa subframe) where a downlink channel, such as a physical downlinkcontrol channel (PDCCH) or physical downlink shared channel (PDSCH),carries the paging message. Additionally, a base station may use a WUSduring idle-mode paging to indicate if the UE is to decode a particulardownlink channel. In some cases, the UE may refrain from monitoring POsuntil a WUS has been detected prior to a PO. While the utilization ofthe WUS may serve to optimize power consumption at the UE, in somecases, the UE may miss the WUS, and therefore also miss a subsequentpaging message including important information pertaining to changes insystem information.

Accordingly, a base station may configure a fallback mode for the UE todetect WUSs to avoid missed detection of paging messages. For example, anetwork may configure a UE to monitor POs regardless of an absence of aWUS to ensure notifications pertaining to changes in system informationare not missed. Such techniques may be referred to as paging monitorperiodicity without WUS (or page monitoring periodicity without WUS) andmay enable the UE to monitor for paging information according to aperiodicity configured by the network. For example, the base station ornetwork may configure the UE to monitor paging information according toa periodicity related to the PO periodicity, the WUS periodicity, aradio resource management (RRM) measurement periodicity, or amodification period related to system information modification.

A method of wireless communication is described. The method may includereceiving a configuration of a page monitoring periodicity, receiving aconfiguration of a wake-up signal, performing discontinuous monitoringfor a plurality of wake-up signals based at least in part on a wake-upsignal periodicity, and monitoring for a paging message during a pagemonitoring period according to the page monitoring periodicity, or thewake-up signal periodicity, or a received wake-up signal, or acombination thereof.

An apparatus for wireless communication is described. The apparatus mayinclude means for receiving a configuration of a page monitoringperiodicity, means for receiving a configuration of a wake-up signal,means for performing discontinuous monitoring for a plurality of wake-upsignals based at least in part on a wake-up signal periodicity, meansfor receiving the wake-up signal based at least in part on the wake-upsignal periodicity, and means for monitoring for a paging message duringa page monitoring period according to the page monitoring periodicity,the wake-up signal periodicity, and the received wake-up signal.

Another apparatus for wireless communication is described. The apparatusmay include a processor, memory in electronic communication with theprocessor, and instructions stored in the memory. The instructions maybe operable to cause the processor to receive a configuration of a pagemonitoring periodicity, receive a configuration of a wake-up signal,perform discontinuous monitoring for a plurality of wake-up signalsbased at least in part on a wake-up signal periodicity, receive thewake-up signal based at least in part on the wake-up signal periodicity,and monitor for a paging message during a page monitoring periodaccording to the page monitoring periodicity, the wake-up signalperiodicity, and the received wake-up signal.

A non-transitory computer-readable medium for wireless communication isdescribed. The non-transitory computer-readable medium may includeinstructions operable to cause a processor to receive a configuration ofa page monitoring periodicity, receive a configuration of a wake-upsignal, perform discontinuous monitoring for a plurality of wake-upsignals based at least in part on a wake-up signal periodicity, receivethe wake-up signal based at least in part on the wake-up signalperiodicity, and monitor for a paging message during a page monitoringperiod according to the page monitoring periodicity, the wake-up signalperiodicity, and the received wake-up signal.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described herein may further include processes,features, means, or instructions for receiving the wake-up signal basedat least in part on the wake-up signal periodicity. Some examples of themethod, apparatus, and non-transitory computer-readable medium describedherein may further include processes, features, means, or instructionsfor determining that the page monitoring periodicity comprises one ormore POs based on the configuration, wherein the wake-up signalperiodicity corresponds to the one or more POs. Some examples of themethod, apparatus, and non-transitory computer-readable medium describedherein may further include processes, features, means, or instructionsfor monitoring for the paging message according to a PO periodicity, orthe received wake-up signal, or a combination thereof.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described herein may further include processes,features, means, or instructions for determining that the pagemonitoring periodicity comprises one or more wake-up signal occasionsbased at least in part on the configuration, wherein the wake-up signalperiodicity corresponds to a paging time window (PTW) periodicity thatincludes one or more POs. Some examples of the method, apparatus, andnon-transitory computer-readable medium described herein may furtherinclude processes, features, means, or instructions for monitoring forthe paging message according to the PTW periodicity, or the receivedwake-up signal, or a combination thereof.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described herein may further include processes,features, means, or instructions for determining that the pagemonitoring periodicity comprises one or more wake-up signal occasionsbased at least in part on the configuration, wherein the wake-up signalperiodicity corresponds to one or more POs. Some examples of the method,apparatus, and non-transitory computer-readable medium described hereinmay further include processes, features, means, or instructions formonitoring for the paging message according to the one or more Pos, orthe received wake-up signal, or a combination thereof.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described herein may further include processes,features, means, or instructions for determining that the pagemonitoring periodicity comprises one or more radio resource management(RRM) measurement periods based at least in part on the configuration.Some examples of the method, apparatus, and non-transitorycomputer-readable medium described herein may further include processes,features, means, or instructions for monitoring for the paging messageaccording to an RRM measurement periodicity.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described herein may further include processes,features, means, or instructions for determining that the pagemonitoring periodicity comprises one or more broadcast control channel(BCCH) modification periods based at least in part on the configuration.Some examples of the method, apparatus, and non-transitorycomputer-readable medium described herein may further include processes,features, means, or instructions for monitoring, according to a BCCHmodification period, for the paging message, or a system informationblock, or a master information block (MIB), or a combination thereof.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described herein, receiving the configurationof the page monitoring periodicity comprises: receiving theconfiguration of the page monitoring periodicity via a systeminformation message, or a radio resource control (RRC) message, or anon-access stratum (NAS) message, or a combination thereof.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described herein may further include processes,features, means, or instructions for identifying the configuration ofthe page monitoring periodicity based at least in part on a time periodduring which the wake-up signal may have been skipped at least once.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described herein may further include processes,features, means, or instructions for identifying the configuration ofthe page monitoring periodicity based at least in part on a relationshipbetween the page monitoring periodicity and one or more otherparameters.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described herein may further include processes,features, means, or instructions for detecting the paging message duringthe page monitoring period based at least in part on the monitoring,wherein the paging message may be detected based at least in part on thereceived wake-up signal.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described herein may further include processes,features, means, or instructions for performing a RRM measurementaccording to the wake-up signal periodicity, wherein an RRM measurementperiodicity comprises one or more wake-up signal occasions. Someexamples of the method, apparatus, and non-transitory computer-readablemedium described herein may further include processes, features, means,or instructions for determining, based on the RRM measurement, areference signal received power (RSRP), or a reference signal receivedquality (RSRQ), or a confirmation of a serving cell, or a combinationthereof.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described herein may further include processes,features, means, or instructions for determining whether the wake-upsignal may be detected at the one or more wake-up signal occasions. Someexamples of the method, apparatus, and non-transitory computer-readablemedium described herein may further include processes, features, means,or instructions for performing the RRM measurement based on adetermination that at least one wake-up signal may be detected at theone or more wake-up signal occasions.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described herein may further include processes,features, means, or instructions for determining whether the wake-upsignal may be detected at the one or more wake-up signal occasions. Someexamples of the method, apparatus, and non-transitory computer-readablemedium described herein may further include processes, features, means,or instructions for performing the RRM measurement at a temporally lastwake-up signal occasion based on a determination that no wake-up signalswere detected at the one or more wake-up signal occasions.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described herein may further include processes,features, means, or instructions for performing a RRM measurementaccording to the page monitoring periodicity. Some examples of themethod, apparatus, and non-transitory computer-readable medium describedherein may further include processes, features, means, or instructionsfor determining, based on the RRM measurement, a RSRP, or a RSRQ, or aconfirmation of a serving cell, or a combination thereof.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described herein may further include processes,features, means, or instructions for identifying a system informationchange notification based at least in part on a detected paging message.

A method of wireless communication is described. The method may includedetermining a page monitoring periodicity for configuring a UE tomonitor for a paging message, determining a wake-up signal periodicityfor a plurality of wake-up signals, the wake-up signal periodicity beingless than or equal to the page monitoring periodicity, and transmittinga configuration of the page monitoring periodicity to the UE, whereinthe configuration indicates a relationship between the page monitoringperiodicity and the wake-up signal periodicity.

An apparatus for wireless communication is described. The apparatus mayinclude means for determining a page monitoring periodicity forconfiguring a UE to monitor for a paging message, means for determininga wake-up signal periodicity for a plurality of wake-up signals, thewake-up signal periodicity being less than or equal to the pagemonitoring periodicity, and means for transmitting a configuration ofthe page monitoring periodicity to the UE, wherein the configurationindicates a relationship between the page monitoring periodicity and thewake-up signal periodicity.

Another apparatus for wireless communication is described. The apparatusmay include a processor, memory in electronic communication with theprocessor, and instructions stored in the memory. The instructions maybe operable to cause the processor to determine a page monitoringperiodicity for configuring a UE to monitor for a paging message,determine a wake-up signal periodicity for a plurality of wake-upsignals, the wake-up signal periodicity being less than or equal to thepage monitoring periodicity, and transmit a configuration of the pagemonitoring periodicity to the UE, wherein the configuration indicates arelationship between the page monitoring periodicity and the wake-upsignal periodicity.

A non-transitory computer-readable medium for wireless communication isdescribed. The non-transitory computer-readable medium may includeinstructions operable to cause a processor to determine a pagemonitoring periodicity for configuring a UE to monitor for a pagingmessage, determine a wake-up signal periodicity for a plurality ofwake-up signals, the wake-up signal periodicity being less than or equalto the page monitoring periodicity, and transmit a configuration of thepage monitoring periodicity to the UE, wherein the configurationindicates a relationship between the page monitoring periodicity and thewake-up signal periodicity.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described herein may further include processes,features, means, or instructions for transmitting, within theconfiguration, an indication that the page monitoring periodicitycomprises one or more POs, wherein the wake-up signal periodicitycorresponds to the one or more POs.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described herein may further include processes,features, means, or instructions for transmitting, within theconfiguration, an indication that the page monitoring periodicitycomprises one or more wake-up signal occasions, wherein the wake-upsignal periodicity corresponds to a PTW periodicity that includes one ormore POs.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described herein may further include processes,features, means, or instructions for transmitting, within theconfiguration, an indication that the page monitoring periodicitycomprises one or more wake-up signal occasions based at least in part onthe configuration, wherein the wake-up signal periodicity corresponds toone or more POs.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described herein may further include processes,features, means, or instructions for transmitting, within theconfiguration, an indication that the page monitoring periodicitycomprises one or more RRM measurement periods.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described herein may further include processes,features, means, or instructions for transmitting, within theconfiguration, an indication that the page monitoring periodicitycomprises one or more BCCH modification periods.

In some examples of the method, apparatus, and non-transitorycomputer-readable medium described herein, transmitting theconfiguration of the page monitoring periodicity comprises: transmittingthe configuration of the page monitoring periodicity via a systeminformation message, or a RRC message, or a NAS message, or acombination thereof.

Some examples of the method, apparatus, and non-transitorycomputer-readable medium described herein may further include processes,features, means, or instructions for transmitting a system informationchange notification within the paging message.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an example of a system for wireless communicationthat supports a fallback mode for wake-up signal (WUS) receivers inaccordance with aspects of the present disclosure.

FIG. 2 illustrates an example of a wireless communication system thatsupports a fallback mode for WUS receivers in accordance with aspects ofthe present disclosure.

FIGS. 3 through 6 illustrate examples of timing diagrams in a systemthat supports a fallback mode for WUS receivers in accordance withaspects of the present disclosure.

FIG. 7 illustrates an example of a process flow in a system thatsupports a fallback mode for WUS receivers in accordance with aspects ofthe present disclosure.

FIGS. 8 through 10 show block diagrams of a device that supports afallback mode for WUS receivers in accordance with aspects of thepresent disclosure.

FIG. 11 illustrates a block diagram of a system including a UE thatsupports a fallback mode for WUS receivers in accordance with aspects ofthe present disclosure.

FIGS. 12 through 14 show block diagrams of a device that supports afallback mode for WUS receivers in accordance with aspects of thepresent disclosure.

FIG. 15 illustrates a block diagram of a system including a base stationthat supports a fallback mode for WUS receivers in accordance withaspects of the present disclosure.

FIGS. 16 through 22 illustrate methods for a fallback mode for WUSreceivers in accordance with aspects of the present disclosure.

DETAILED DESCRIPTION

In a wireless communication system, a base station may signal thatpaging and/or system information is available in a channel for one ormore user equipment (UEs). For example, the base station may send pagesor paging messages to a UE indicate that information is available forthe UE. In some cases, the paging messages may carry an indication of achange in system information (e.g., a modification of a systeminformation block (SIB)). In some examples, the paging messages may besent during paging occasions (POs) of a downlink control channel. Thedownlink control channel may be a physical downlink control channel(PDCCH) or a narrowband (NB)-PDCCH. POs may be periodic intervalsconfigured for paging messages to allow the UEs to enter a sleep ordiscontinuous reception (DRX) state in between POs, and this process maybe referred to as idle mode paging. In some examples, the paginginformation may be sent in a physical downlink shared channel (PDSCH),which may be sent during the same transmission time interval (TTI)(e.g., subframe) as the PDCCH or during a different TTI.

A base station may use a physical signal (e.g., a wake-up signal (WUS))to indicate that a UE should decode a subsequent downlink physicalchannel (e.g., PDCCH or PDSCH) in idle mode paging. The WUS may furtherserve to optimize power consumption at the UE. In some cases, the basestation may introduce a periodic synchronization signal (SS) (e.g., aprimary SS (PSS), a secondary SS (SSS), and the like) in combinationwith the WUS to ensure sufficient synchronization performance. In othercases, the base station may refrain from transmitting the periodic SSwith the WUS or in a discontinuous transmission (DTX) mode.

In some cases, the network may change one or more information fieldspertaining to system information. Further, the network may transmit apaging message indicating that the system information has been modified.For instance, the network may update a field or information elementwithin the paging message pertaining to a modification in systeminformation. Upon receiving a paging message indicating the change insystem information, the UE may attempt to monitor for additional detailspertaining to the change in system information. A UE capable of, andconfigured for, detecting a WUS, may detect the WUS based on a WUSperiodicity configured by higher layers.

In some cases, however, if the UE is configured to utilize the WUS forpower saving, the UE may not read a downlink channel (e.g., PDCCH/PDSCH)if a WUS is not detected. In some circumstances, the UE may miss a WUS,even though a WUS was transmitted for a paging message. For instance, alarge maximum coupling loss (MCL) due to a size of a coverage area,frequency offset, time drift, or inter-cell interference with aneighboring base station may lead to a missed WUS. Additionally oralternatively, network errors, such as a base station reset, may lead toa change in a WUS configuration. For example, a base station may restartin a safe mode due to an electrical issue, causing a loss in WUSoperation. If a UE is unable to detect the WUS correctly, the UE maymiss important changes in system information in paging information,hampering the UE's performance.

As described herein, to alleviate network and/or UE performancedegradation experienced with missed changes in system information, thenetwork may configure a UE to monitor paging information periodically,even when a configured WUS is not detected. For instance, the networkmay configure the UE with a page monitoring periodicity to enable ortrigger a UE to monitor paging information. The configuration may beexplicitly signaled (e.g., via a SIB, a Radio Resource Control (RRC)configuration, a higher layer parameter, or the like), implicitlysignaled, or may be determined based on preconfigured parameters. Theconfiguration used for monitoring for the paging message may be referredto as a page monitor periodicity without WUS, and may enable the UE toperiodically monitor for paging information according to a cycleconfigured by the network. For example, the base station or network mayconfigure the UE to monitor paging information according to a cyclerelated to the PO periodicity, the WUS periodicity, radio resourcemanagement (RRM) measurement periodicity, or a modification periodrelated to system information modification.

Aspects of the disclosure are initially described in the context of awireless communications system. Aspects are the disclosure are thendescribed with reference to timing diagrams. Aspects of the disclosureare further illustrated by and described with reference to apparatusdiagrams, system diagrams, and flowcharts that relate to fallback modefor wake-up signal receivers.

FIG. 1 illustrates an example of a wireless communications system 100 inaccordance with various aspects of the present disclosure. The wirelesscommunications system 100 includes base stations 105, UEs 115, and acore network 130. In some examples, the wireless communications system100 may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A)network, or a New Radio (NR) network. In some cases, wirelesscommunications system 100 may support enhanced broadband communications,ultra-reliable (e.g., mission critical) communications, low latencycommunications, or communications with low-cost and low-complexitydevices.

Base stations 105 may wirelessly communicate with UEs 115 via one ormore base station antennas. Base stations 105 described herein mayinclude or may be referred to by those skilled in the art as a basetransceiver station, a radio base station, an access point, a radiotransceiver, a NodeB, an eNodeB (eNB), a next-generation Node B orgiga-nodeB (either of which may be referred to as a gNB), a Home NodeB,a Home eNodeB, or some other suitable terminology. Wirelesscommunications system 100 may include base stations 105 of differenttypes (e.g., macro or small cell base stations). The UEs 115 describedherein may be able to communicate with various types of base stations105 and network equipment including macro eNBs, small cell eNBs, gNBs,relay base stations, and the like.

Each base station 105 may be associated with a particular geographiccoverage area 110 in which communications with various UEs 115 issupported. Each base station 105 may provide communication coverage fora respective geographic coverage area 110 via communication links 125,and communication links 125 between a base station 105 and a UE 115 mayutilize one or more carriers. Communication links 125 shown in wirelesscommunications system 100 may include uplink transmissions from a UE 115to a base station 105, or downlink transmissions, from a base station105 to a UE 115. Downlink transmissions may also be called forward linktransmissions while uplink transmissions may also be called reverse linktransmissions.

The geographic coverage area 110 for a base station 105 may be dividedinto sectors making up only a portion of the geographic coverage area110, and each sector may be associated with a cell. For example, eachbase station 105 may provide communication coverage for a macro cell, asmall cell, a hot spot, or other types of cells, or various combinationsthereof. In some examples, a base station 105 may be movable andtherefore provide communication coverage for a moving geographiccoverage area 110. In some examples, different geographic coverage areas110 associated with different technologies may overlap, and overlappinggeographic coverage areas 110 associated with different technologies maybe supported by the same base station 105 or by different base stations105. The wireless communications system 100 may include, for example, aheterogeneous LTE/LTE-A or NR network in which different types of basestations 105 provide coverage for various geographic coverage areas 110.

The term “cell” refers to a logical communication entity used forcommunication with a base station 105 (e.g., over a carrier), and may beassociated with an identifier for distinguishing neighboring cells(e.g., a physical cell identifier (PCID), a virtual cell identifier(VCID)) operating via the same or a different carrier. In some examples,a carrier may support multiple cells, and different cells may beconfigured according to different protocol types (e.g., machine-typecommunication (MTC), narrowband Internet-of-Things (NB-IoT), enhancedmobile broadband (eMBB), or others) that may provide access fordifferent types of devices. In some cases, the term “cell” may refer toa portion of a geographic coverage area 110 (e.g., a sector) over whichthe logical entity operates.

UEs 115 may be dispersed throughout the wireless communications system100, and each UE 115 may be stationary or mobile. A UE 115 may also bereferred to as a mobile device, a wireless device, a remote device, ahandheld device, or a subscriber device, or some other suitableterminology, where the “device” may also be referred to as a unit, astation, a terminal, or a client. A UE 115 may also be a personalelectronic device such as a cellular phone, a personal digital assistant(PDA), a tablet computer, a laptop computer, or a personal computer. Insome examples, a UE 115 may also refer to a wireless local loop (WLL)station, an Internet of Things (IoT) device, an Internet of Everything(IoE) device, or an MTC device, or the like, which may be implemented invarious articles such as appliances, vehicles, meters, or the like.

Some UEs 115, such as MTC or IoT devices, may be low cost or lowcomplexity devices, and may provide for automated communication betweenmachines (e.g., via Machine-to-Machine (M2M) communication). M2Mcommunication or MTC may refer to data communication technologies thatallow devices to communicate with one another or a base station 105without human intervention. In some examples, M2M communication or MTCmay include communications from devices that integrate sensors or metersto measure or capture information and relay that information to acentral server or application program that can make use of theinformation or present the information to humans interacting with theprogram or application. Some UEs 115 may be designed to collectinformation or enable automated behavior of machines. Examples ofapplications for MTC devices include smart metering, inventorymonitoring, water level monitoring, equipment monitoring, healthcaremonitoring, wildlife monitoring, weather and geological eventmonitoring, fleet management and tracking, remote security sensing,physical access control, and transaction-based business charging.

Some UEs 115 may be configured to employ operating modes that reducepower consumption, such as half-duplex communications (e.g., a mode thatsupports one-way communication via transmission or reception, but nottransmission and reception simultaneously). In some examples half-duplexcommunications may be performed at a reduced peak rate. Other powerconservation techniques for UEs 115 include entering a power saving“deep sleep” mode when not engaging in active communications, oroperating over a limited bandwidth (e.g., according to narrowbandcommunications). In some cases, UEs 115 may be designed to supportcritical functions (e.g., mission critical functions), and a wirelesscommunications system 100 may be configured to provide ultra-reliablecommunications for these functions.

In some cases, a UE 115 may also be able to communicate directly withother UEs 115 (e.g., using a peer-to-peer (P2P) or device-to-device(D2D) protocol). One or more of a group of UEs 115 utilizing D2Dcommunications may be within the geographic coverage area 110 of a basestation 105. Other UEs 115 in such a group may be outside the geographiccoverage area 110 of a base station 105, or be otherwise unable toreceive transmissions from a base station 105. In some cases, groups ofUEs 115 communicating via D2D communications may utilize a one-to-many(1:M) system in which each UE 115 transmits to every other UE 115 in thegroup. In some cases, a base station 105 facilitates the scheduling ofresources for D2D communications. In other cases, D2D communications arecarried out between UEs 115 without the involvement of a base station105.

Base stations 105 may communicate with the core network 130 and with oneanother. For example, base stations 105 may interface with the corenetwork 130 through backhaul links 132 (e.g., via an Si or otherinterface). Base stations 105 may communicate with one another overbackhaul links 134 (e.g., via an X2 or other interface) either directly(e.g., directly between base stations 105) or indirectly (e.g., via corenetwork 130).

The core network 130 may provide user authentication, accessauthorization, tracking, Internet Protocol (IP) connectivity, and otheraccess, routing, or mobility functions. The core network 130 may be anevolved packet core (EPC), which may include at least one mobilitymanagement entity (MME), at least one serving gateway (S-GW), and atleast one Packet Data Network (PDN) gateway (P-GW). The MME may managenon-access stratum (e.g., control plane) functions such as mobility,authentication, and bearer management for UEs 115 served by basestations 105 associated with the EPC. User IP packets may be transferredthrough the S-GW, which itself may be connected to the P-GW. The P-GWmay provide IP address allocation as well as other functions. The P-GWmay be connected to the network operators IP services. The operators IPservices may include access to the Internet, Intranet(s), an IPMultimedia Subsystem (IMS), or a Packet-Switched (PS) Streaming Service.

At least some of the network devices, such as a base station 105, mayinclude subcomponents such as an access network entity, which may be anexample of an access node controller (ANC). Each access network entitymay communicate with UEs 115 through a number of other access networktransmission entities, which may be referred to as a radio head, a smartradio head, or a transmission/reception point (TRP). In someconfigurations, various functions of each access network entity or basestation 105 may be distributed across various network devices (e.g.,radio heads and access network controllers) or consolidated into asingle network device (e.g., a base station 105).

Wireless communications system 100 may operate using one or morefrequency bands, typically in the range of 300 megahertz (MHz) to 300gigahertz (GHz). Generally, the region from 300 MHz to 3 GHz is known asthe ultra-high frequency (UHF) region or decimeter band, since thewavelengths range from approximately one decimeter to one meter inlength. UHF waves may be blocked or redirected by buildings andenvironmental features. However, the waves may penetrate structuressufficiently for a macro cell to provide service to UEs 115 locatedindoors. Transmission of UHF waves may be associated with smallerantennas and shorter range (e.g., less than 100 km) compared totransmission using the smaller frequencies and longer waves of the highfrequency (HF) or very high frequency (VHF) portion of the spectrumbelow 300 MHz.

Wireless communications system 100 may also operate in a super highfrequency (SHF) region using frequency bands from 3 GHz to 30 GHz, alsoknown as the centimeter band. The SHF region includes bands such as the5 GHz industrial, scientific, and medical (ISM) bands, which may be usedopportunistically by devices that can tolerate interference from otherusers.

Wireless communications system 100 may also operate in an extremely highfrequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz),also known as the millimeter band. In some examples, wirelesscommunications system 100 may support millimeter wave (mmW)communications between UEs 115 and base stations 105, and EHF antennasof the respective devices may be even smaller and more closely spacedthan UHF antennas. In some cases, this may facilitate use of antennaarrays within a UE 115. However, the propagation of EHF transmissionsmay be subject to even greater atmospheric attenuation and shorter rangethan SHF or UHF transmissions. Techniques disclosed herein may beemployed across transmissions that use one or more different frequencyregions, and designated use of bands across these frequency regions maydiffer by country or regulating body.

In some cases, wireless communications system 100 may utilize bothlicensed and unlicensed radio frequency spectrum bands. For example,wireless communications system 100 may employ License Assisted Access(LAA), LTE-Unlicensed (LTE-U) radio access technology, or NR technologyin an unlicensed band such as the 5 GHz ISM band. When operating inunlicensed radio frequency spectrum bands, wireless devices such as basestations 105 and UEs 115 may employ listen-before-talk (LBT) proceduresto ensure a frequency channel is clear before transmitting data. In somecases, operations in unlicensed bands may be based on a CA configurationin conjunction with CCs operating in a licensed band (e.g., LAA).Operations in unlicensed spectrum may include downlink transmissions,uplink transmissions, peer-to-peer transmissions, or a combination ofthese. Duplexing in unlicensed spectrum may be based on frequencydivision duplexing (FDD), time division duplexing (TDD), or acombination of both.

In some examples, base station 105 or UE 115 may be equipped withmultiple antennas, which may be used to employ techniques such astransmit diversity, receive diversity, multiple-input multiple-output(MIMO) communications, or beamforming. For example, wirelesscommunications system 100 may use a transmission scheme between atransmitting device (e.g., a base station 105) and a receiving device(e.g., a UE 115), where the transmitting device is equipped withmultiple antennas and the receiving devices are equipped with one ormore antennas. MIMO communications may employ multipath signalpropagation to increase the spectral efficiency by transmitting orreceiving multiple signals via different spatial layers, which may bereferred to as spatial multiplexing. The multiple signals may, forexample, be transmitted by the transmitting device via differentantennas or different combinations of antennas. Likewise, the multiplesignals may be received by the receiving device via different antennasor different combinations of antennas. Each of the multiple signals maybe referred to as a separate spatial stream, and may carry bitsassociated with the same data stream (e.g., the same codeword) ordifferent data streams. Different spatial layers may be associated withdifferent antenna ports used for channel measurement and reporting. MIMOtechniques include single-user MIMO (SU-MIMO) where multiple spatiallayers are transmitted to the same receiving device, and multiple-userMIMO (MU-MIMO) where multiple spatial layers are transmitted to multipledevices.

Beamforming, which may also be referred to as spatial filtering,directional transmission, or directional reception, is a signalprocessing technique that may be used at a transmitting device or areceiving device (e.g., a base station 105 or a UE 115) to shape orsteer an antenna beam (e.g., a transmit beam or receive beam) along aspatial path between the transmitting device and the receiving device.Beamforming may be achieved by combining the signals communicated viaantenna elements of an antenna array such that signals propagating atparticular orientations with respect to an antenna array experienceconstructive interference while others experience destructiveinterference. The adjustment of signals communicated via the antennaelements may include a transmitting device or a receiving deviceapplying certain amplitude and phase offsets to signals carried via eachof the antenna elements associated with the device. The adjustmentsassociated with each of the antenna elements may be defined by abeamforming weight set associated with a particular orientation (e.g.,with respect to the antenna array of the transmitting device orreceiving device, or with respect to some other orientation).

In one example, a base station 105 may use multiple antennas or antennaarrays to conduct beamforming operations for directional communicationswith a UE 115. For instance, some signals (e.g., synchronizationsignals, reference signals, beam selection signals, or other controlsignals) may be transmitted by a base station 105 multiple times indifferent directions, which may include a signal being transmittedaccording to different beamforming weight sets associated with differentdirections of transmission. Transmissions in different beam directionsmay be used to identify (e.g., by the base station 105 or a receivingdevice, such as a UE 115) a beam direction for subsequent transmissionand/or reception by the base station 105. Some signals, such as datasignals associated with a particular receiving device, may betransmitted by a base station 105 in a single beam direction (e.g., adirection associated with the receiving device, such as a UE 115). Insome examples, the beam direction associated with transmissions along asingle beam direction may be determined based at least in in part on asignal that was transmitted in different beam directions. For example, aUE 115 may receive one or more of the signals transmitted by the basestation 105 in different directions, and the UE 115 may report to thebase station 105 an indication of the signal it received with a highestsignal quality, or an otherwise acceptable signal quality. Althoughthese techniques are described with reference to signals transmitted inone or more directions by a base station 105, a UE 115 may employsimilar techniques for transmitting signals multiple times in differentdirections (e.g., for identifying a beam direction for subsequenttransmission or reception by the UE 115), or transmitting a signal in asingle direction (e.g., for transmitting data to a receiving device).

A receiving device (e.g., a UE 115, which may be an example of a mmWreceiving device) may try multiple receive beams when receiving varioussignals from the base station 105, such as synchronization signals,reference signals, beam selection signals, or other control signals. Forexample, a receiving device may try multiple receive directions byreceiving via different antenna subarrays, by processing receivedsignals according to different antenna subarrays, by receiving accordingto different receive beamforming weight sets applied to signals receivedat a plurality of antenna elements of an antenna array, or by processingreceived signals according to different receive beamforming weight setsapplied to signals received at a plurality of antenna elements of anantenna array, any of which may be referred to as “listening” accordingto different receive beams or receive directions. In some examples areceiving device may use a single receive beam to receive along a singlebeam direction (e.g., when receiving a data signal). The single receivebeam may be aligned in a beam direction determined based at least inpart on listening according to different receive beam directions (e.g.,a beam direction determined to have a highest signal strength, highestsignal-to-noise ratio, or otherwise acceptable signal quality based atleast in part on listening according to multiple beam directions).

In some cases, the antennas of a base station 105 or UE 115 may belocated within one or more antenna arrays, which may support MIMOoperations, or transmit or receive beamforming. For example, one or morebase station antennas or antenna arrays may be co-located at an antennaassembly, such as an antenna tower. In some cases, antennas or antennaarrays associated with a base station 105 may be located in diversegeographic locations. A base station 105 may have an antenna array witha number of rows and columns of antenna ports that the base station 105may use to support beamforming of communications with a UE 115.Likewise, a UE 115 may have one or more antenna arrays that may supportvarious MIMO or beamforming operations.

In some cases, wireless communications system 100 may be a packet-basednetwork that operate according to a layered protocol stack. In the userplane, communications at the bearer or Packet Data Convergence Protocol(PDCP) layer may be IP-based. A Radio Link Control (RLC) layer may insome cases perform packet segmentation and reassembly to communicateover logical channels. A Medium Access Control (MAC) layer may performpriority handling and multiplexing of logical channels into transportchannels. The MAC layer may also use hybrid automatic repeat request(HARD) to provide retransmission at the MAC layer to improve linkefficiency. In the control plane, the Radio Resource Control (RRC)protocol layer may provide establishment, configuration, and maintenanceof an RRC connection between a UE 115 and a base station 105 or corenetwork 130 supporting radio bearers for user plane data. At thePhysical (PHY) layer, transport channels may be mapped to physicalchannels.

In some cases, UEs 115 and base stations 105 may support retransmissionsof data to increase the likelihood that data is received successfully.HARQ feedback is one technique of increasing the likelihood that data isreceived correctly over a communication link 125. HARQ may include acombination of error detection (e.g., using a cyclic redundancy check(CRC)), forward error correction (FEC), and retransmission (e.g.,automatic repeat request (ARQ)). HARQ may improve throughput at the MAClayer in poor radio conditions (e.g., signal-to-noise conditions). Insome cases, a wireless device may support same-slot HARQ feedback, wherethe device may provide HARQ feedback in a specific slot for datareceived in a previous symbol in the slot. In other cases, the devicemay provide HARQ feedback in a subsequent slot, or according to someother time interval.

Time intervals in LTE or NR may be expressed in multiples of a basictime unit, which may, for example, refer to a sampling period ofT_(s)=1/30,720,000 seconds. Time intervals of a communications resourcemay be organized according to radio frames each having a duration of 10milliseconds (ms), where the frame period may be expressed asT_(f)=307,200 T_(s). The radio frames may be identified by a systemframe number (SFN) ranging from 0 to 1023. Each frame may include 10subframes numbered from 0 to 9, and each subframe may have a duration of1 ms. A subframe may be further divided into 2 slots each having aduration of 0.5 ms, and each slot may contain 6 or 7 modulation symbolperiods (e.g., depending on the length of the cyclic prefix prepended toeach symbol period). Excluding the cyclic prefix, each symbol period maycontain 2048 sampling periods. In some cases a subframe may be thesmallest scheduling unit of the wireless communications system 100, andmay be referred to as a transmission time interval (TTI). In othercases, a smallest scheduling unit of the wireless communications system100 may be shorter than a subframe or may be dynamically selected (e.g.,in bursts of shortened TTIs (sTTIs) or in selected component carriersusing sTTIs).

In some wireless communications systems, a slot may further be dividedinto multiple mini-slots containing one or more symbols. In someinstances, a symbol of a mini-slot or a mini-slot may be the smallestunit of scheduling. Each symbol may vary in duration depending on thesubcarrier spacing or frequency band of operation, for example. Further,some wireless communications systems may implement slot aggregation inwhich multiple slots or mini-slots are aggregated together and used forcommunication between a UE 115 and a base station 105.

The term “carrier” refers to a set of radio frequency spectrum resourceshaving a defined physical layer structure for supporting communicationsover a communication link 125. For example, a carrier of a communicationlink 125 may include a portion of a radio frequency spectrum band thatis operated according to physical layer channels for a given radioaccess technology. Each physical layer channel may carry user data,control information, or other signaling. A carrier may be associatedwith a pre-defined frequency channel (e.g., an E-UTRA absolute radiofrequency channel number (EARFCN)), and may be positioned according to achannel raster for discovery by UEs 115. Carriers may be downlink oruplink (e.g., in an FDD mode), or be configured to carry downlink anduplink communications (e.g., in a TDD mode). In some examples, signalwaveforms transmitted over a carrier may be made up of multiplesub-carriers (e.g., using multi-carrier modulation (MCM) techniques suchas orthogonal frequency-division multiplexing (OFDM) or DFT-s-OFDM).

The organizational structure of the carriers may be different fordifferent radio access technologies (e.g., LTE, LTE-A, NR, etc.). Forexample, communications over a carrier may be organized according toTTIs or slots, each of which may include user data as well as controlinformation or signaling to support decoding the user data. A carriermay also include dedicated acquisition signaling (e.g., synchronizationsignals or system information, etc.) and control signaling thatcoordinates operation for the carrier. In some examples (e.g., in acarrier aggregation configuration), a carrier may also have acquisitionsignaling or control signaling that coordinates operations for othercarriers.

Physical channels may be multiplexed on a carrier according to varioustechniques. A physical control channel and a physical data channel maybe multiplexed on a downlink carrier, for example, using time divisionmultiplexing (TDM) techniques, frequency division multiplexing (FDM)techniques, or hybrid TDM-FDM techniques. In some examples, controlinformation transmitted in a physical control channel may be distributedbetween different control regions in a cascaded manner (e.g., between acommon control region or common search space and one or more UE-specificcontrol regions or UE-specific search spaces).

A carrier may be associated with a particular bandwidth of the radiofrequency spectrum, and in some examples the carrier bandwidth may bereferred to as a “system bandwidth” of the carrier or the wirelesscommunications system 100. For example, the carrier bandwidth may be oneof a number of predetermined bandwidths for carriers of a particularradio access technology (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 MHz). Insome examples, each served UE 115 may be configured for operating overportions or all of the carrier bandwidth. In other examples, some UEs115 may be configured for operation using a narrowband protocol typethat is associated with a predefined portion or range (e.g., set ofsubcarriers or RBs) within a carrier (e.g., “in-band” deployment of anarrowband protocol type).

In a system employing MCM techniques, a resource element may include ofone symbol period (e.g., a duration of one modulation symbol) and onesubcarrier, where the symbol period and subcarrier spacing are inverselyrelated. The number of bits carried by each resource element may dependon the modulation scheme (e.g., the order of the modulation scheme).Thus, the more resource elements that a UE 115 receives and the higherthe order of the modulation scheme, the higher the data rate may be forthe UE 115. In MIMO systems, a wireless communications resource mayrefer to a combination of a radio frequency spectrum resource, a timeresource, and a spatial resource (e.g., spatial layers), and the use ofmultiple spatial layers may further increase the data rate forcommunications with a UE 115.

Devices of the wireless communications system 100 (e.g., base stations105 or UEs 115) may have a hardware configuration that supportscommunications over a particular carrier bandwidth, or may beconfigurable to support communications over one of a set of carrierbandwidths. In some examples, the wireless communications system 100 mayinclude base stations 105 and/or UEs that can support simultaneouscommunications via carriers associated with more than one differentcarrier bandwidth.

Wireless communications system 100 may support communication with a UE115 on multiple cells or carriers, a feature which may be referred to ascarrier aggregation (CA) or multi-carrier operation. A UE 115 may beconfigured with multiple downlink CCs and one or more uplink CCsaccording to a carrier aggregation configuration. Carrier aggregationmay be used with both FDD and TDD component carriers.

In some cases, wireless communications system 100 may utilize enhancedcomponent carriers (eCCs). An eCC may be characterized by one or morefeatures including wider carrier or frequency channel bandwidth, shortersymbol duration, shorter TTI duration, or modified control channelconfiguration. In some cases, an eCC may be associated with a carrieraggregation configuration or a dual connectivity configuration (e.g.,when multiple serving cells have a suboptimal or non-ideal backhaullink). An eCC may also be configured for use in unlicensed spectrum orshared spectrum (e.g., where more than one operator is allowed to usethe spectrum). An eCC characterized by wide carrier bandwidth mayinclude one or more segments that may be utilized by UEs 115 that arenot capable of monitoring the whole carrier bandwidth or are otherwiseconfigured to use a limited carrier bandwidth (e.g., to conserve power).

In some cases, an eCC may utilize a different symbol duration than otherCCs, which may include use of a reduced symbol duration as compared withsymbol durations of the other CCs. A shorter symbol duration may beassociated with increased spacing between adjacent subcarriers. Adevice, such as a UE 115 or base station 105, utilizing eCCs maytransmit wideband signals (e.g., according to frequency channel orcarrier bandwidths of 20, 40, 60, 80 MHz, etc.) at reduced symboldurations (e.g., 16.67 microseconds). A TTI in eCC may include of one ormultiple symbol periods. In some cases, the TTI duration (that is, thenumber of symbol periods in a TTI) may be variable.

Wireless communications systems, such as an NR system, may utilize anycombination of licensed, shared, and unlicensed spectrum bands, amongothers. The flexibility of eCC symbol duration and subcarrier spacingmay allow for the use of eCC across multiple spectrums. In someexamples, NR shared spectrum may increase spectrum utilization andspectral efficiency, specifically through dynamic vertical (e.g., acrossfrequency) and horizontal (e.g., across time) sharing of resources.

In some cases, a UE 115 may monitor a communication link 125continuously for an indication that the UE 115 may receive data. Inother cases (e.g., to conserve power and extend battery life) a UE 115may be configured with a discontinuous reception (DRX) cycle. A DRXcycle may include an “On Duration” when the UE 115 may monitor forcontrol information (e.g., on PDCCH) and a “DRX period” when the UE 115may power down radio components. In some cases, a UE 115 may beconfigured with a short DRX cycle and a long DRX cycle. In some cases, aUE 115 may enter a long DRX cycle if it is inactive for one or moreshort DRX cycles. The transition between the short DRX cycle, the longDRX cycle and continuous reception may be controlled by an internaltimer or by messaging from a base station 105. A UE 115 may receivescheduling messages on PDCCH during the On Duration. While monitoringPDCCH for a scheduling message, the UE 115 may initiate a “DRXInactivity Timer.” If a scheduling message is successfully received, theUE 115 may prepare to receive data and the DRX Inactivity Timer may bereset. When the DRX Inactivity Timer expires without receiving ascheduling message, the UE 115 may move into a short DRX cycle and maystart a “DRX Short Cycle Timer.” When the DRX Short Cycle Timer expires,the UE 115 may resume a long DRX cycle. In some cases, there may be aone-to-one relationship between a PO and a DRX cycle. Additionally, inextended DRX (eDRX) there may be two periodicities configured, where onemay define an eDRX periodicity and the other defines the PO periodicity,which may include a number of POs to monitor at a start of every eDRXperiodicity and determined by a paging time window (PTW).

In wireless communications system 100, a base station 105 may signal achange in system information to a UE 115 via a page or paging message.The paging message may carry an indication of the change in systeminformation and may also indicate that paging information is availablefor one or more UEs 115 associated with the base station 105. A UE 115may periodically monitor for paging messages transmitted from the basestation during POs. A PO may be a TTI where a downlink channel such as aPDCCH or PDSCH addresses the paging message. A base station 105 inwireless communications system 100 may use a WUS during idle-mode pagingto indicate if the UE 115 needs to decode a particular physical downlinkchannel to determine whether there is a change in system information. Insome cases, the UE 115 may refrain from monitoring POs until a WUS hasbeen detected prior to a PO. To ensure notifications pertaining tochanges in system information are not missed (e.g., should a transmittedWUS not be received), the network may configure a UE 115 to monitor POsregardless of an absence of a WUS. A paging monitor periodicity withoutWUS may be configured and may enable the UE 115 to periodically monitorfor paging information according to a cycle configured by the network.For example, the base station 105 or network may configure the UE 115 tomonitor paging information according to a cycle related to the POperiodicity, the WUS periodicity, RRM measurement periodicity, or amodification period related to system information modification.

FIG. 2 illustrates an example of a wireless communication system 200that supports a fallback mode for WUS receivers in accordance withvarious aspects of the present disclosure. In some examples, wirelesscommunications system 200 may implement aspects of wirelesscommunications system 100. Wireless communications system 200 mayinclude base station 105-a and UE 115-a, which may be examples of thecorresponding devices described with reference to FIG. 1. Base station105-a and UE 115-a may be in communication with each other overcommunication link 125-a. In some cases, wireless communications system200 may operate in mmW spectrum, or may support radio technologies suchas NB-IoT, or eMTC.

In wireless communications system 200, base station 105-a may send pagesor paging messages 205 to one or more UEs 115, including UE 115-a, toindicate that information (such as downlink data or other information)is available for one or more of the UEs 115. In some cases, the pagingmessages 205 may also carry an indication of a change in systeminformation (e.g., in a SIB). The paging messages 205 may be sent usingPOs of a downlink control channel, where the downlink control channelmay be a PDCCH or a NB-PDCCH. POs may be periodic intervals configuredfor paging messages 205 to allow UE 115-a to enter a sleep or DRX statein between POs, and this process may be referred to as idle mode paging.In some examples, the paging information may be sent in a PDSCH, whichmay be sent during the same TTI as a PDCCH or during a different TTIthan the PDCCH.

In some cases, base station 105-a may use a power saving physical signal(e.g., WUS 210) to indicate if UE 115-a should decode a subsequentdownlink physical channel (e.g., PDCCH or PDSCH) in idle mode paging. Insome cases, WUS 210 may serve to optimize power consumption at UE 115-a,for example, where UE 115-a may rely on receipt of WUS 210 before wakingfrom a sleep state. In some cases, base station 105-a may introduce aperiodic synchronization signals (e.g., PSS or SSS) in combination withWUS 210 (and/or with DTX) to ensure sufficient synchronizationperformance. In other cases, base station 105-a may not introduceperiodic synchronization signals in a WUS mode (which may alsocorrespond to a DTX mode).

In some cases, the network or base station 105-a may change one or moreinformation fields pertaining to a SIB. In such cases, base station105-a may proceed to transmit the modified SIB, as well as another SIB(e.g., SIB1) with an updated field (e.g., systemInfoValueTag). Further,base station 105-a may transmit paging message 205 with an indicationthat the system information has been modified. For instance, the basestation 105-a may update a field or information element within pagingmessage 205 pertaining to a modification in system information (e.g.,systemInfoModification). In some cases, the field may comprise a Booleanvalue and may, for example, be set to “true” (e.g., using Boolean logicwith a bit value of ‘1’).

Upon receiving paging message 205 indicating a change in systeminformation (e.g., systemInfoModification=true), UE 115-a may attemptmonitoring for SIB1 for additional details pertaining to the change insystem information. For instance, the systemInfoValueTag transmittedwithin SIB1 may change during a modification period, and may provide anindication of the change in system information. In some cases, themodification period may be specified in another system information block(e.g., modificationPeriodCoeff in SIB2). In some cases, UE 115-a maydetermine that the system information changes at the boundary of a nextmodification period.

In some cases, UE 115-a may be capable of and configured to detect WUS210, and may thus detect WUS 210 based on a WUS periodicity configuredby higher layers. Thus, if UE 115-a is configured to detect WUS 210 forpower saving, UE 115-a may not read a downlink channel, such as PDCCH orPDSCH, if WUS 210 is not detected. In some circumstances, however, UE115-a may miss WUS 210 even though WUS 210 was transmitted for pagingmessage 205. For instance, a large MCL due to a relatively largecoverage area, frequency offset, time drift, or inter-cell interferencewith a neighboring base station 105 (not shown) or another device maylead to a missed WUS 210. In some cases, network errors or a reset atbase station 105-a (e.g., due to a power failure) may lead to a changein a WUS configuration. For example, base station 105-a may restart insafe mode due to an electrical issue, causing a loss in WUS operation.As a result, if UE 115-a is incapable of detecting WUS 210 correctly, UE115-a may miss important changes in system information conveyed by thepaging information within paging message 205, which may affect theperformance of UE 115-a.

To alleviate network and/or UE performance impacted due to missingchanges in system information, base station 105-a may configure UE 115-ato monitor paging information periodically. That is, even when WUS 210is missed by (e.g., not received) UE 115-a, UE 115-a may monitor forpaging information sent from base station 105-a. For instance, basestation 105-a may configure UE 115-a with a “page monitoring periodicitywithout WUS” to enable or trigger UE 115-a to monitor paging informationoutside of the receipt of WUSs. In some cases, the configuration may besignaled explicitly (e.g., via SIB, RRC, or through a higher layerparameter). For example, paging time window (PTW) and DRX parameters maybe negotiated via non-access stratum (NAS) signaling messages, and thepage monitoring periodicity configuration may be indicated via such NASsignaling. In other cases, base station 105-a may utilize a predefinedparameter to configure UE 115-a with page monitoring periodicity withoutWUS. For instance, base station 105-a may set a maximum time span duringwhich the UE 115-a may skip monitoring WUS 210 at least once. Skippingmonitoring WUS 210 may correspond to monitoring paging information inthe absence of WUS 210. In some cases, the configuration may be signaledimplicitly, for example, by stating a relationship between the ‘pagemonitoring periodicity without WUS’ and another parameter, such as a DRXcycle.

As described herein, these techniques may enable a fallback mode for UE115-a when configured to operate using WUSs 210 to periodically monitorfor paging message 205. In such cases, the periodicity by which UE 115-awakes to monitor for paging message 205 may be dynamically configured,allowing for different levels of protection against missed/failedreception of WUS 210. For instance, base station 105-a may configure thepage monitoring periodicity based on channel conditions or interferenceexperienced within a cell. Accordingly, the page monitoring periodicitymay be configured for UE 115-a to wake up more or less frequently basedat least on part on the dynamic configuration of the page monitoringperiodicity.

In some examples, the use of the fallback mode may enable efficientcommunications when UE 115-a is mobile. For instance, UE 115-a may betravelling between different cells. The respective cells may eachsupport the use of WUSs, and UE 115-a may have information associatedwith WUSs used by a neighboring cell (e.g., a cell that previouslyserved UE 115-a before UE 115-a moved into a cell provided by basestation 105-a). Upon moving into the cell provided by base station105-a, UE 115-a may not immediately have information (e.g., aconfiguration) associated with a WUS 210 transmitted by base station105-a. As such, the use of the fallback mode, where UE 115-a may wake upto obtain paging information from base station 105-a without relying onreceipt of WUS 210 (e.g., based on a page monitoring periodicity), mayenable UE 115-a to obtain paging information (and system informationindicated by paging messages) from base station 105-a. UE 115-a may thusskip the detection of WUS 210 and may detect paging messages directly,where the use of such techniques may be based on UE 115-a moving betweencells.

FIG. 3 illustrates an example of a timing diagram 300 in a system thatsupports a fallback mode for WUS receivers in accordance with variousaspects of the present disclosure. In some examples, timing diagram 300may implement aspects of wireless communications system 100 and/or 200.Timing diagram 300 shows an example of how a UE 115 may utilize awake-up periodicity for idle mode paging while employing a pagemonitoring periodicity without WUS.

Timing diagram 300 may illustrate a depiction of what occurs at the PHYlayer for a UE 115 configured with page monitoring periodicity withoutWUS by a network. In a first deployment scheme of a page monitoringwithout WUS, the network may configure a UE 115 to periodically detect(e.g., every X POs or X DRXs) a downlink channel (e.g., PDCCH or PDSCH)comprising paging information 320, where each DRX cycle may include onePO. As illustrated in timing diagram 300, WUS occasions 303 mayrepresent occasions during which a base station 105 may transmit a WUS,which may be detected by the UE 115. Additionally, the time periodbetween POs may be depicted by PO periodicity 305, and page monitoringperiodicity 310 denotes the page monitoring periodicity without WUShaving an X*DRX periodicity. In the example illustrated in timingdiagram 300, X=4. However, X may be any integer, where X≥1.

In some cases, a WUS 315 (e.g., WUS 315-a) may inform the UE 115 tomonitor one PO in a DRX cycle. For instance, if X=1, a UE 115 mayfallback to a mode and assume that no WUS 315 is enabled. In such cases,the UE 115 may monitor for a downlink channel (PDCCH/PDSCH) in each PO.In other cases, if X>1 (e.g., X=8, X=16, etc.), the page monitoringperiodicity without WUS may be set to “X*DRX.” In such cases, the UE 115may monitor a downlink channel for paging information 320 every X DRXsor X POs, regardless of the presence or detection of a WUS 315. In somecases, as illustrated in timing diagram 300, a UE 115 configured withX*DRX periodicity may miss WUS 325. The UE 115, however, may stillproceed to detect paging information 320-a due to being configured withpage monitoring periodicity 310. That is, regardless of the missed WUS325, the UE 115 may proceed to wake up from a sleep state to receivepaging information 320-a.

FIG. 4 illustrates an example of a timing diagram 400 in a system thatsupports a fallback mode for WUS receivers in accordance with variousaspects of the present disclosure. In some examples, timing diagram 400may implement aspects of wireless communications system 100 and/or 200.Timing diagram 400 shows an example of how a wake-up cycle for idle modepaging may operate while employing a page monitoring periodicity withoutWUS. The timing diagram 400 may illustrate a depiction of what occurs atthe PHY layer for a UE 115 configured with page monitoring periodicitywithout WUS by the network. In the example illustrated by timing diagram400, a network may configure a UE 115 to detect a downlink channel forpaging information every Y WUS occasions, where Y≥1. Unlike the exampledescribed with reference to FIG. 3, the granularity of paginginformation detection in this example may be based on a WUS, and not aPO.

In some cases, WUS occasions 403 may represent occasions during which abase station 105 may transmit a WUS 415, which may be detected by the UE115. However, as illustrated in timing diagram 400, a WUS 415 (e.g., atWUS occasion 403-a) may inform a UE 115 to monitor one PO or multiplePOs within a PTW in an extended DRX (eDRX) cycle (e.g., there may be oneWUS 415 every Y POs, where Y≥1). The WUS periodicity 405 may be equal toY*PO periodicity (or Y*DRX). In some cases, if Y=1, the UE 115 mayfallback to a particular mode and assume that no WUS 415 is enabled. Insuch cases, the UE 115 may monitor for paging information 420 in one ormore POs within a PTW in the eDRX cycle. As illustrated, the time periodwhen WUSs 415 may be transmitted may be depicted by WUS periodicity 405,and page monitoring periodicity 410 may represent a page monitoringperiodicity without WUS, which may have a page monitoring periodicity410 equal to Y*WUS periodicity 405. That is, in cases where Y>1 (e.g.,Y=4, 8, 16, etc.), the page monitoring periodicity without WUS may beset to Y*WUS periodicity 405. The UE 115 may monitor downlink channel(s)for paging information 420 regardless of detecting a WUS 415 to reducethe probability of missing changes to system information or otherinformation that may affect communications efficiency of the UE 115. Forinstance, as illustrated in timing diagram 400, a UE 115 configured apage monitoring periodicity 410 having a Y*WUS periodicity 405 may missWUS 425. However, the UE 115 may still detect paging information 420-adue to being configured with the page monitoring periodicity withoutWUS.

FIG. 5 illustrates an example of a timing diagram 500 in a system thatsupports a fallback mode for WUS receivers in accordance with variousaspects of the present disclosure. In some examples, timing diagram 500may implement aspects of wireless communications system 100 and/or 200.

In a third deployment scheme of paging monitoring without WUS, a networkmay configure a UE 115 to detect downlink channels for paging every MRRM measurement periods, where M≥1. For instance, In some cases, a RRMmeasurement may include measuring an RSRP, an RSRQ, confirming a servingcell or camping cell, etc. In some examples, the measurements mayindicate a mobility condition of the UE 115 (e.g., a low-mobility UE115). As illustrated in timing diagram 500, WUS occasions 503 mayrepresent occasions during which a base station 105 may transmit a WUS515, which may be detected by a UE 115. In some cases, the UE 115 maynot perform RRM measurements in every DRX cycle, enabling power savingsat the UE 115.

Further, RRM measurements may be performed according to an RRMmeasurement periodicity 505 configured by the network. That is, thenetwork may determine whether a UE 115 may use an RRM measurementperiodicity 505 having a certain duration, and accordingly provide theconfiguration of the RRM measurement periodicity 505 to the UE 115. Inone example, the network may configure RRM measurement periodicity 505based on RRM measurements performed by a UE 115. For instance, previousRRM measurements performed by the UE 115 (e.g., for a serving cell) mayhave variation within a pre-determined threshold, and a base station 105may indicate a longer RRM measurement periodicity 505 configured for theUE 115 (e.g., based on the variation). In some cases, RRM measurementsmay be based on synchronization signals (e.g., PSS, SSS, re-sync SS foreMTC, narrowband PSS (NPSS) or narrowband SSS (NSSS) for NB-IoT),reference signals (e.g., cell-specific reference signal (CRS),narrowband reference signal (NRS) for NB-IoT), or a combination thereof.

In some cases, if M=1, the UE 115 may monitor for a notificationpertaining to a change in system information indicated by paging atleast once every RRM measurement period. In other cases, if M>1 (e.g.,M=4, 8, 16, etc.), a page monitoring periodicity without WUS may be setto M*RRM measurement periodicity 505, as shown by page monitoringperiodicity 510. Thus, the UE 115 may monitor for paging information 520every M RRM measurement periods, regardless of whether a WUS is detectedor not. For instance, as illustrated in timing diagram 500, a UE 115configured with a page monitoring periodicity 510 equivalent to M*RRMmeasurement periodicity 505 may miss WUS 525. However, the UE 115 maystill proceed to detect paging 520-a due to being configured with a pagemonitoring periodicity without WUS.

In some cases, a UE 115 may include different receivers (e.g., receiverchains, antennas, antenna arrays, etc.) for detecting a WUS andperforming RRM measurements. For instance, the UE 115 may use a firstreceiver for monitoring paging and performing RRM measurements, whilethe UE 115 may use a second receiver (e.g., having a lower power thanthe first receiver) for detecting a WUS. Thus, when the UE 115 switcheson the first receiver for performing RRM measurements, the UE 115 maydetect paging while the receiver is still on. Such techniques mayfurther serve to optimize power consumption at the UE 115, where the UE115 may refrain from waking on additional occasions, and may insteaddetect paging information while performing RRM measurements.

In some cases, the UE 115 may perform RRM measurements prior to each WUSoccasion. In such cases, RRM measurements may be modified or relaxed tofurther optimize power consumption at the UE 115. For instance, toperform RRM measurements prior to receiving a WUS, the UE 115 maysynchronize (e.g., using a received WUS) or wake-up the receiverassociated with RRM measurements (e.g., the first receiver) in additionto monitoring for the WUS. In some cases, the UE 115 may limitperforming RRM measurements to efficiently utilize its receivingresources. For instance, the UE 115 may perform RRM measurements onceevery P DRX cycles, where P may be an integer greater than 1. In suchcases, the RRM measurements may be performed less frequently (e.g., ascompared to performing RRM measurements during every DRX cycle), therebyenabling the UE 115 to remain in a power saving mode for a longerduration of time. Additionally or alternatively, when RRM measurementshave a relaxed periodicity (e.g., using less frequent RRM measurementoccasions), a UE 115 may utilize the WUS received during an RRMmeasurement period to synchronize with a base station 105. In suchcases, the WUS may be configured for every DRX cycle, but the UE 115 mayonly wake-up every P DRX cycles, when the WUS may be detected.

In some cases, the UE 115 may perform RRM measurements once every R=XPOs=X WUS occasions, where each PO may be configured with one WUS. Insome other cases, the UE 115 may perform RRM measurements once every R=YWUS occasions, if POs are configured with more than one WUS, forexample, in eDRX, as described in the deployment schemes above. In somecases, if there is a WUS detected within the R WUS occasions, the UE 115may perform RRM measurements and monitor paging after detecting a WUS.In other examples, if no WUS is detected within the R WUS occasions, theUE 115 may perform RRM measurements at the Rth occasion.

FIG. 6 illustrates an example of a timing diagram 600 in a system thatsupports a fallback mode for WUS receivers in accordance with variousaspects of the present disclosure. In some examples, timing diagram 600may implement aspects of wireless communications system 100 and/or 200.Timing diagram 600 may illustrate modification periods deployed in somewireless communication systems, which are used to notify a UE 115 of achange in system information.

In some cases, change of system information may occur during specificradio frames, and the same system information may be transmitted withina modification period. As illustrated in timing diagram 600, differentshading patterns indicate different system information. Further,modification period 605-a (e.g., a broadcast control channel (BCCH)modification period) denotes the change notification time period (ormodification period (n)), whereas modification period 605-b (e.g.,another BCCH modification period) denotes the time period where updatedsystem information is transmitted (modification period (n+1)). Forinstance, system information 615-a and 615-a in modification period605-a may be updated to system information 620-a and 620-b,respectively, in modification period 605-b. In some examples, othersignals of timing diagram 600 with the same shading patterns inmodification periods 605-a and 605-b (and any subsequent modificationperiods 605), may remain unchanged. For instance, a signal 630 may notchange (or be modified) from one modification period 605 to the next.

In a fourth deployment scheme of page monitoring periodicity withoutWUS, the network may configure a UE 115 to monitor a notificationpertaining to changes in system information in paging and/or SIB1 (orMIB) every N modification periods, where N≥1. For instance, similar tothe deployment schemes described above, if N=1, the UE 115 may monitor anotification related to system information change in a paging message,SIB1 or MIB, or a combination thereof, during every modification period605. Information pertaining to the modification period 605 may bereceived in another SIB, such as SIB2. In some other cases, if N>1, thepage monitoring periodicity without WUS may be set at N*modificationperiod 605-b, as illustrated by page monitoring periodicity 610. Thus,the UE 115 may monitor paging every N modification periods 605. Further,N may be different based on the type of radio technology deployed at theUE 115 (e.g., eMTC, NB-IoT, etc.).

In some cases, the UE 115 may autonomously decide when to perform one ormore RRM measurements within R WUS occasions, as described withreference to FIG. 5. In an alternate scheme of performing RRMmeasurements in conjunction with WUS detection, the UE 115 may carry outRRM measurements when configured by the network or base station to readdownlink channels such as PDCCH or PDSCH carrying paging information,regardless of the presence or detection of WUS (i.e., according to theconfigured page monitor periodicity 610 without WUS). For instance, ifthe page monitor periodicity 610 may be configured as N*modificationperiod, the UE 115 may perform RRM measurements as well as cellconfirmation (i.e., for serving cell or camping cell) when there is apotential change in system information, regardless of detecting a WUS.

FIG. 7 illustrates an example of a process flow 700 that supports afallback mode for WUS receivers in accordance with various aspects ofthe present disclosure. In some examples, process flow 700 may implementaspects of wireless communications system 100 and/or 200. Further,process flow 700 may be implemented by a UE 115-b and a base station105-b, which may be examples of a UE 115 and a base station 105 asdescribed with reference to FIGS. 1 and 2. In some examples, the processillustrated by process flow 700 may be implemented in an NR wirelesssystem, and may support the use of a page monitoring periodicity for theefficient detection of paging messages by a UE 115.

At 705, base station 105-b may determine a page monitoring periodicity(e.g., “page monitoring periodicity without WUS”) for configuring UE115-b to monitor for a paging message. In some wireless communicationsystems, WUSs may be deployed as power saving signals, enabling a UE toremain in idle mode until a paging message of a PO indicates a change insystem information, or paging information for the UE. At 710, basestation 105-b may thus determine a WUS periodicity for a plurality ofWUSs, where the WUS periodicity may be less than or equal to the pagemonitoring periodicity.

At 715, base station 105-b may transmit, and UE 115-b may receive, aconfiguration of the page monitoring periodicity. In some examples, thepage monitoring configuration may optionally indicate a relationshipbetween the page monitoring periodicity determined at 705, and the WUSperiodicity determined at 710. In some cases, base station 105-b maytransmit, within the configuration, an indication that the pagemonitoring periodicity comprises one or more POs, or an indication thatthe page monitoring periodicity comprises one or more WUS occasions, oran indication that the page monitoring periodicity comprises one or moreRRM measurement periods, or a combination thereof. In some cases, theconfiguration may also provide an indication that the page monitoringperiodicity comprises one or more BCCH modification periods. Theconfiguration may be transmitted via a system information message, a RRCmessage, or a NAS message.

At 720, UE 115-b may determine the page monitoring periodicity, forexample, based on the received configuration. For instance, UE 115-b maydetermine that the page monitoring periodicity includes one or more POsbased on the configuration (e.g., the page monitoring periodicity isX*DRX periodicity, as described above with reference to FIG. 3), where aWUS periodicity may also correspond to the one or more POs. In suchcases, the configuration may cover both DRX (where there is only one PO)and eDRX (where there are one or more POs determined by a PTW). Forexample, UE 115-b may determine that the page monitoring periodicityincludes one or more WUS occasions based on the configuration, where theWUS periodicity corresponds to a PTW periodicity that includes one ormore POs (e.g., the page monitoring periodicity is X*WUS periodicity, asdescribed above with reference to FIG. 4).

In some examples, UE 115-b may determine that the page monitoringperiodicity comprises one or more RRM measurement periods based on theconfiguration (e.g., the page monitoring periodicity is X*RRMmeasurement periodicity, as described above with reference to FIG. 5).Additionally or alternatively, UE 115-b may determine that the pagemonitoring periodicity comprises one or more BCCH modification periodsbased on the configuration (e.g., as described with reference to FIG.6).

At 725, UE 115-b may proceed to perform discontinuous monitoring for aplurality of WUSs based on the WUS periodicity, and monitor pagingmessages during a page monitoring period according the page monitoringperiodicity, or the WUS periodicity, or a WUS received based on the WUSperiodicity, or a combination thereof. For example, UE 115-b may monitorfor the paging message according to the PO periodicity and the receivedWUS. In other cases, UE 115-b may monitor for the paging messageaccording to the PTW periodicity and the received WUS. Additionally oralternatively, UE 115-b may monitor for the paging message according tothe one or more POs and the received WUS. In some cases, UE 115-b maymonitor for the paging message according to an RRM measurementperiodicity, or may monitor, according to a BCCH modification period,for the paging message, or an SIB, or an MIB, or a combination thereof.

FIG. 8 shows a block diagram 800 of a wireless device 805 that supportsa fallback mode for WUS receivers in accordance with aspects of thepresent disclosure. Wireless device 805 may be an example of aspects ofa UE 115 as described herein. Wireless device 805 may include receiver810, UE communications manager 815, and transmitter 820. Wireless device805 may also include a processor. Each of these components may be incommunication with one another (e.g., via one or more buses).

Receiver 810 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to fallbackmode for WUS receivers, etc.). Information may be passed on to othercomponents of the device via link 825. The receiver 810 may be anexample of aspects of the transceiver 1135 described with reference toFIG. 11. The receiver 810 may utilize a single antenna or a set ofantennas. In some cases, receiver 810 may receive a WUS based on a WUSperiodicity.

UE communications manager 815 may be an example of aspects of the UEcommunications manager 1115 described with reference to FIG. 11. UEcommunications manager 815 and/or at least some of its varioussub-components may be implemented in hardware, software executed by aprocessor, firmware, or any combination thereof. If implemented insoftware executed by a processor, the functions of the UE communicationsmanager 815 and/or at least some of its various sub-components may beexecuted by a general-purpose processor, a digital signal processor(DSP), an application-specific integrated circuit (ASIC), anfield-programmable gate array (FPGA) or other programmable logic device,discrete gate or transistor logic, discrete hardware components, or anycombination thereof designed to perform the functions described in thepresent disclosure.

The UE communications manager 815 and/or at least some of its varioussub-components may be physically located at various positions, includingbeing distributed such that portions of functions are implemented atdifferent physical locations by one or more physical devices. In someexamples, UE communications manager 815 and/or at least some of itsvarious sub-components may be a separate and distinct component inaccordance with various aspects of the present disclosure. In otherexamples, UE communications manager 815 and/or at least some of itsvarious sub-components may be combined with one or more other hardwarecomponents, including but not limited to an I/O component, atransceiver, a network server, another computing device, one or moreother components described in the present disclosure, or a combinationthereof in accordance with various aspects of the present disclosure.

UE communications manager 815 or receiver 810 may receive aconfiguration of a page monitoring periodicity, and receive aconfiguration of a WUS. In some cases, UE communications manager 815 mayperform discontinuous monitoring for a set of WUSs based on a WUSperiodicity, and monitor for a paging message during a page monitoringperiod according to the page monitoring periodicity, the WUSperiodicity, and the received WUS.

In some examples, UE communications manager 815 may receive aconfiguration of a wake-up signal periodicity, perform discontinuousmonitoring for a plurality of wake-up signals based at least in part onthe wake-up signal periodicity, and perform an RRM measurement accordingto an RRM measurement periodicity, wherein the RRM measurementperiodicity corresponds to one or more wake-up signal occasionsaccording to the wake-up signal periodicity.

Transmitter 820 may transmit signals generated by other components ofthe device. In some cases, transmitter 820 may receive information fromother components of the device via link 830. In some examples, thetransmitter 820 may be collocated with a receiver 810 in a transceivermodule. For example, the transmitter 820 may be an example of aspects ofthe transceiver 1135 described with reference to FIG. 11. Thetransmitter 820 may utilize a single antenna or a set of antennas.

FIG. 9 shows a block diagram 900 of a wireless device 905 that supportsa fallback mode for WUS receivers in accordance with aspects of thepresent disclosure. Wireless device 905 may be an example of aspects ofa wireless device 805 or a UE 115 as described with reference to FIG. 8.Wireless device 905 may include receiver 910, UE communications manager915, and transmitter 920. Wireless device 905 may also include aprocessor. Each of these components may be in communication with oneanother (e.g., via one or more buses).

Receiver 910 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to fallbackmode for WUS receivers, etc.). Information may be passed on to othercomponents of the device via link 940. The receiver 910 may be anexample of aspects of the transceiver 1135 described with reference toFIG. 11. The receiver 910 may utilize a single antenna or a set ofantennas.

UE communications manager 915 may be an example of aspects of the UEcommunications manager 1115 described with reference to FIG. 11. UEcommunications manager 915 may also include UE page monitoring component925, UE wake-up signal component 930, and decoder 935.

UE page monitoring component 925 may receive a configuration of a pagemonitoring periodicity, identify a system information changenotification based on a detected paging message, and determine that thepage monitoring periodicity includes one or more POs based on theconfiguration. In some cases, the WUS periodicity may correspond to theone or more Pos. In some examples, UE page monitoring component 925 maymonitor for the paging message according to a PO periodicity and thereceived WUS. In some cases, UE page monitoring component 925 maymonitor for the paging message according to the PTW periodicity and thereceived WUS and/or monitor for the paging message according to an RRMmeasurement periodicity. Additionally or alternatively, UE pagemonitoring component 925 may monitor for the paging message during apage monitoring period according to the page monitoring periodicity, theWUS periodicity, and the received WUS. In some cases, UE page monitoringcomponent 925 may identify the configuration of the page monitoringperiodicity based on a time period during which the WUS has been skippedat least once.

Further, UE page monitoring component 925 may identify the configurationof the page monitoring periodicity based on a relationship between thepage monitoring periodicity and one or more other parameters, and detectthe paging message during the page monitoring period based on themonitoring, where the paging message is detected based on the receivedWUS. In some cases, UE page monitoring component 925 may monitor,according to a BCCH modification period, for the paging message, asystem information block, a MIB, or a combination thereof. In somecases, receiving the configuration of the page monitoring periodicityincludes: receiving the configuration of the page monitoring periodicityvia a system information message, an RRC message, a NAS message, or acombination thereof. In some cases, UE page monitoring component 925 maybe in communication with various components of UE communications manager915 via link 950.

UE wake-up signal component 930 may receive a configuration of a WUS,perform discontinuous monitoring for a set of WUSs based on a WUSperiodicity, determine that the page monitoring periodicity includes oneor more WUS occasions based on the configuration, where the WUSperiodicity corresponds to a PTW periodicity that includes one or morePOs, and determine that the page monitoring periodicity includes one ormore WUS occasions based on the configuration, where the WUS periodicitycorresponds to one or more POs. In some cases, UE wake-up signalcomponent 930 may further determine whether the WUS is detected at theone or more WUS occasions.

The decoder 935 may decode information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to fallbackmode for WUS receivers, etc.) received by the various components ofwireless device 905. In some cases, decoder 935 may receive theinformation from various components of the device via link 955.

Transmitter 920 may transmit signals generated by other components ofthe device, and received via link 945. In some examples, the transmitter920 may be collocated with a receiver 910 in a transceiver module. Forexample, the transmitter 920 may be an example of aspects of thetransceiver 1135 described with reference to FIG. 11. The transmitter920 may utilize a single antenna or a set of antennas.

FIG. 10 shows a block diagram 1000 of a UE communications manager 1015that supports a fallback mode for WUS receivers in accordance withaspects of the present disclosure. The UE communications manager 1015may be an example of aspects of a UE communications manager 815, a UEcommunications manager 915, or a UE communications manager 1115described with reference to FIGS. 8, 9, and 11. The UE communicationsmanager 1015 may include UE page monitoring component 1020, UE wake-upsignal component 1025, RRM measurement component 1030, UE broadcastchannel component 1035, and decoder 1040. Each of these modules maycommunicate, directly or indirectly, with one another (e.g., via one ormore buses).

UE page monitoring component 1020 may receive a configuration of a pagemonitoring periodicity, identify a system information changenotification based on a detected paging message, and determine that thepage monitoring periodicity includes one or more POs based on theconfiguration, where the WUS periodicity corresponds to the one or morePos. In some examples, UE page monitoring component 1020 may monitor forthe paging message according to a PO periodicity and the received WUS.In some cases, UE page monitoring component 1020 may further monitor forthe paging message according to the PTW periodicity and the receivedWUS, monitor for the paging message according to an RRM measurementperiodicity, and monitor for a paging message during a page monitoringperiod according to the page monitoring periodicity, the WUSperiodicity, and the received WUS. In some cases, UE page monitoringcomponent 1020 may identify the configuration of the page monitoringperiodicity based on a time period during which the WUS has been skippedat least once.

In some cases, UE page monitoring component 1020 may identify theconfiguration of the page monitoring periodicity based on a relationshipbetween the page monitoring periodicity and one or more otherparameters, detect the paging message during the page monitoring periodbased on the monitoring, where the paging message is detected based onthe received WUS, and monitor, according to a BCCH modification period,for the paging message, or a system information block, or a MIB, or acombination thereof. In some cases, receiving the configuration of thepage monitoring periodicity includes receiving the configuration of thepage monitoring periodicity via a system information message, or a RRCmessage, or a NAS message, or a combination thereof. UE page monitoringcomponent 1020 may monitor for the paging message according to the oneor more POs and the received WUS.

UE wake-up signal component 1025 may receive a configuration of a WUSand perform discontinuous monitoring for a set of WUSs based on a WUSperiodicity. In some examples, UE wake-up signal component 1025 maydetermine that the page monitoring periodicity includes one or more WUSoccasions based on the configuration, where the WUS periodicitycorresponds to a PTW periodicity that includes one or more POs, anddetermine that the page monitoring periodicity includes one or more WUSoccasions based on the configuration. In some cases, the WUS periodicitycorresponds to one or more POs. In some cases, UE wake-up signalcomponent 1025 may determine whether the WUS is detected at the one ormore WUS occasions.

RRM measurement component 1030 may determine that the page monitoringperiodicity includes one or more RRM measurement periods based on theconfiguration, perform a RRM measurement according to the WUSperiodicity, where an RRM measurement periodicity includes one or moreWUS occasions, determine, based on the RRM measurement, a RSRP, a RSRQ,a confirmation of a serving cell, or a combination thereof. In somecases, RRM measurement component 1030 may perform the RRM measurementbased on a determination that at least one WUS is detected at the one ormore WUS occasions, perform the RRM measurement at a temporally last WUSoccasion based on a determination that no WUSs were detected at the oneor more WUS occasions, and perform a RRM measurement according to thepage monitoring periodicity.

UE broadcast channel component 1035 may determine that the pagemonitoring periodicity includes one or more BCCH modification periodsbased on the configuration. Decoder 1040 may decode information such aspackets, user data, or control information associated with variousinformation channels (e.g., control channels, data channels, andinformation related to fallback mode for WUS receivers, etc.) obtainedby the various components of UE communications manager 1015, or wirelessdevice hosting the UE communications manager.

FIG. 11 shows a diagram of a system 1100 including a device 1105 thatsupports a fallback mode for WUS receivers in accordance with aspects ofthe present disclosure. Device 1105 may be an example of or include thecomponents of wireless device 805, wireless device 905, or a UE 115 asdescribed herein, e.g., with reference to FIGS. 8 and 9. Device 1105 mayinclude components for bi-directional voice and data communicationsincluding components for transmitting and receiving communications,including UE communications manager 1115, processor 1120, memory 1125,software 1130, transceiver 1135, antenna 1140, and I/O controller 1145.These components may be in electronic communication via one or morebuses (e.g., bus 1110). Device 1105 may communicate wirelessly with oneor more base stations 105.

Processor 1120 may include an intelligent hardware device, (e.g., ageneral-purpose processor, a DSP, a central processing unit (CPU), amicrocontroller, an ASIC, an FPGA, a programmable logic device, adiscrete gate or transistor logic component, a discrete hardwarecomponent, or any combination thereof). In some cases, processor 1120may be configured to operate a memory array using a memory controller.In other cases, a memory controller may be integrated into processor1120. Processor 1120 may be configured to execute computer-readableinstructions stored in a memory to perform various functions (e.g.,functions or tasks supporting fallback mode for WUS receivers).

Memory 1125 may include random-access memory (RAM) and read-only memory(ROM). The memory 1125 may store computer-readable, computer-executablesoftware 1130 including instructions that, when executed, cause theprocessor to perform various functions described herein. In some cases,the memory 1125 may contain, among other things, a basic input/outputsystem (BIOS) which may control basic hardware or software operationsuch as the interaction with peripheral components or devices.

Software 1130 may include code to implement aspects of the presentdisclosure, including code to support fallback mode for WUS receivers.Software 1130 may be stored in a non-transitory computer-readable mediumsuch as system memory or other memory. In some cases, the software 1130may not be directly executable by the processor but may cause a computer(e.g., when compiled and executed) to perform functions describedherein.

Transceiver 1135 may communicate bi-directionally, via one or moreantennas, wired, or wireless links as described herein. For example, thetransceiver 1135 may represent a wireless transceiver and maycommunicate bi-directionally with another wireless transceiver. Thetransceiver 1135 may also include a modem to modulate the packets andprovide the modulated packets to the antennas for transmission, and todemodulate packets received from the antennas. In some cases, thewireless device may include a single antenna 1140. However, in somecases the device may have more than one antenna 1140, which may becapable of concurrently transmitting or receiving multiple wirelesstransmissions.

I/O controller 1145 may manage input and output signals for device 1105.I/O controller 1145 may also manage peripherals not integrated intodevice 1105. In some cases, I/O controller 1145 may represent a physicalconnection or port to an external peripheral. In some cases, I/Ocontroller 1145 may utilize an operating system such as iOS®, ANDROID®,MS-DOS®, MS-WINDOWS®, OS/2®, UNIX®, LINUX®, or another known operatingsystem. In other cases, I/O controller 1145 may represent or interactwith a modem, a keyboard, a mouse, a touchscreen, or a similar device.In some cases, I/O controller 1145 may be implemented as part of aprocessor. In some cases, a user may interact with device 1105 via I/Ocontroller 1145 or via hardware components controlled by I/O controller1145.

FIG. 12 shows a block diagram 1200 of a wireless device 1205 thatsupports a fallback mode for WUS receivers in accordance with aspects ofthe present disclosure. Wireless device 1205 may be an example ofaspects of a base station 105 as described herein. Wireless device 1205may include receiver 1210, base station communications manager 1215, andtransmitter 1220. Wireless device 1205 may also include a processor.Each of these components may be in communication with one another (e.g.,via one or more buses).

Receiver 1210 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to fallbackmode for WUS receivers, etc.). Information may be passed on to othercomponents of the device via link 1225. The receiver 1210 may be anexample of aspects of the transceiver 1535 described with reference toFIG. 15. The receiver 1210 may utilize a single antenna or a set ofantennas.

Base station communications manager 1215 may be an example of aspects ofthe base station communications manager 1515 described with reference toFIG. 15. Base station communications manager 1215 and/or at least someof its various sub-components may be implemented in hardware, softwareexecuted by a processor, firmware, or any combination thereof. Ifimplemented in software executed by a processor, the functions of thebase station communications manager 1215 and/or at least some of itsvarious sub-components may be executed by a general-purpose processor, aDSP, an ASIC, an FPGA or other programmable logic device, discrete gateor transistor logic, discrete hardware components, or any combinationthereof designed to perform the functions described in the presentdisclosure.

The base station communications manager 1215 and/or at least some of itsvarious sub-components may be physically located at various positions,including being distributed such that portions of functions areimplemented at different physical locations by one or more physicaldevices. In some examples, base station communications manager 1215and/or at least some of its various sub-components may be a separate anddistinct component in accordance with various aspects of the presentdisclosure. In some cases, base station communications manager 1215 maypass on information to transmitter 1220 via link 1230, and may receiverinformation from receiver 1210 via link 1225. In other examples, basestation communications manager 1215 and/or at least some of its varioussub-components may be combined with one or more other hardwarecomponents, including but not limited to an I/O component, atransceiver, a network server, another computing device, one or moreother components described in the present disclosure, or a combinationthereof in accordance with various aspects of the present disclosure.

Base station communications manager 1215 may determine a page monitoringperiodicity for configuring a UE 115 to monitor for a paging message anddetermine a WUS periodicity for a set of WUSs, the WUS periodicity beingless than or equal to the page monitoring periodicity.

In some examples, base station communications manager 1215 may determinea wake-up signal periodicity for a plurality of wake-up signals,configure, based on the wake-up signal periodicity, an RRM measurementperiodicity for a UE to perform an RRM measurement, wherein the RRMmeasurement periodicity corresponds to one or more wake-up signaloccasions according to the wake-up signal periodicity, and transmit aconfiguration indicating the RRM measurement periodicity to the UE.

Transmitter 1220 may transmit signals generated by other components ofthe device, and received via link 1230. In some examples, thetransmitter 1220 may be collocated with a receiver 1210 in a transceivermodule. For example, the transmitter 1220 may be an example of aspectsof the transceiver 1535 described with reference to FIG. 15. Thetransmitter 1220 may utilize a single antenna or a set of antennas.

Transmitter 1220 may transmit a configuration of the page monitoringperiodicity to the UE, where the configuration indicates a relationshipbetween the page monitoring periodicity and the WUS periodicity.

FIG. 13 shows a block diagram 1300 of a wireless device 1305 thatsupports a fallback mode for WUS receivers in accordance with aspects ofthe present disclosure. Wireless device 1305 may be an example ofaspects of a wireless device 1205 or a base station 105 as describedwith reference to FIG. 12. Wireless device 1305 may include receiver1310, base station communications manager 1315, and transmitter 1320.Wireless device 1305 may also include a processor. Each of thesecomponents may be in communication with one another (e.g., via one ormore buses).

Receiver 1310 may receive information such as packets, user data, orcontrol information associated with various information channels (e.g.,control channels, data channels, and information related to fallbackmode for WUS receivers, etc.). Information may be passed on to othercomponents of the device via link 1335. The receiver 1310 may be anexample of aspects of the transceiver 1535 described with reference toFIG. 15. The receiver 1310 may utilize a single antenna or a set ofantennas.

Base station communications manager 1315 may be an example of aspects ofthe base station communications manager 1515 described with reference toFIG. 15. Base station communications manager 1315 may also include basestation page monitoring component 1325 and base station wake-up signalcomponent 1330.

Base station page monitoring component 1325 may determine a pagemonitoring periodicity for configuring a UE 115 to monitor for a pagingmessage and transmit, within the configuration, an indication that thepage monitoring periodicity includes one or more POs, where the WUSperiodicity corresponds to the one or more POs. In some cases,transmitting the configuration of the page monitoring periodicityincludes transmitting the configuration of the page monitoringperiodicity via a system information message, or an RRC message, or aNAS message, or a combination thereof.

Base station wake-up signal component 1330 may determine a WUSperiodicity for a set of WUSs, the WUS periodicity being less than orequal to the page monitoring periodicity, transmit, within theconfiguration, an indication that the page monitoring periodicityincludes one or more WUS occasions, where the WUS periodicitycorresponds to a PTW periodicity that includes one or more POs, andtransmit, within the configuration, an indication that the pagemonitoring periodicity includes one or more WUS occasions based on theconfiguration, where the WUS periodicity corresponds to one or more POs.

Transmitter 1320 may transmit signals generated by other components ofthe device, and received via link 1340. In some examples, thetransmitter 1320 may be collocated with a receiver 1310 in a transceivermodule. For example, the transmitter 1320 may be an example of aspectsof the transceiver 1535 described with reference to FIG. 15. Thetransmitter 1320 may utilize a single antenna or a set of antennas.

FIG. 14 shows a block diagram 1400 of a base station communicationsmanager 1415 that supports a fallback mode for WUS receivers inaccordance with aspects of the present disclosure. The base stationcommunications manager 1415 may be an example of aspects of a basestation communications manager 1515 described with reference to FIGS.12, 13, and 15. The base station communications manager 1415 may includebase station page monitoring component 1420, base station wake-up signalcomponent 1425, RRM component 1430, and base station broadcast channelcomponent 1435. Each of these modules may communicate, directly orindirectly, with one another (e.g., via one or more buses).

Base station page monitoring component 1420 may determine a pagemonitoring periodicity for configuring a UE 115 to monitor for a pagingmessage and transmit, within the configuration, an indication that thepage monitoring periodicity includes one or more POs, where the WUSperiodicity corresponds to the one or more POs. In some cases,transmitting the configuration of the page monitoring periodicityincludes transmitting the configuration of the page monitoringperiodicity via a system information message, or an RRC message, or aNAS message, or a combination thereof.

Base station wake-up signal component 1425 may determine a WUSperiodicity for a set of WUSs, the WUS periodicity being less than orequal to the page monitoring periodicity. In some cases, base stationwake-up signal component 1425 may transmit, within the configuration, anindication that the page monitoring periodicity includes one or more WUSoccasions, where the WUS periodicity corresponds to a PTW periodicitythat includes one or more Pos. Additionally or alternatively, basestation wake-up signal component 1425 may transmit, within theconfiguration, an indication that the page monitoring periodicityincludes one or more WUS occasions based on the configuration, where theWUS periodicity corresponds to one or more POs.

RRM component 1430 may transmit, within the configuration, an indicationthat the page monitoring periodicity includes one or more RRMmeasurement periods. Base station broadcast channel component 1435 maytransmit, within the configuration, an indication that the pagemonitoring periodicity includes one or more BCCH modification periodsand transmit a system information change notification within the pagingmessage.

FIG. 15 shows a diagram of a system 1500 including a device 1505 thatsupports a fallback mode for WUS receivers in accordance with aspects ofthe present disclosure. Device 1505 may be an example of or include thecomponents of base station 105 as described herein, e.g., with referenceto FIG. 1. Device 1505 may include components for bi-directional voiceand data communications including components for transmitting andreceiving communications, including base station communications manager1515, processor 1520, memory 1525, software 1530, transceiver 1535,antenna 1540, network communications manager 1545, and inter-stationcommunications manager 1550. These components may be in electroniccommunication via one or more buses (e.g., bus 1510). Device 1505 maycommunicate wirelessly with one or more UEs 115.

Processor 1520 may include an intelligent hardware device, (e.g., ageneral-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, anFPGA, a programmable logic device, a discrete gate or transistor logiccomponent, a discrete hardware component, or any combination thereof).In some cases, processor 1520 may be configured to operate a memoryarray using a memory controller. In other cases, a memory controller maybe integrated into processor 1520. Processor 1520 may be configured toexecute computer-readable instructions stored in a memory to performvarious functions (e.g., functions or tasks supporting fallback mode forWUS receivers).

Memory 1525 may include RAM and ROM. The memory 1525 may storecomputer-readable, computer-executable software 1530 includinginstructions that, when executed, cause the processor to perform variousfunctions described herein. In some cases, the memory 1525 may contain,among other things, a BIOS which may control basic hardware or softwareoperation such as the interaction with peripheral components or devices.

Software 1530 may include code to implement aspects of the presentdisclosure, including code to support fallback mode for WUS receivers.Software 1530 may be stored in a non-transitory computer-readable mediumsuch as system memory or other memory. In some cases, the software 1530may not be directly executable by the processor but may cause a computer(e.g., when compiled and executed) to perform functions describedherein.

Transceiver 1535 may communicate bi-directionally, via one or moreantennas, wired, or wireless links as described herein. For example, thetransceiver 1535 may represent a wireless transceiver and maycommunicate bi-directionally with another wireless transceiver. Thetransceiver 1535 may also include a modem to modulate the packets andprovide the modulated packets to the antennas for transmission, and todemodulate packets received from the antennas. In some cases, thewireless device may include a single antenna 1540. However, in somecases the device may have more than one antenna 1540, which may becapable of concurrently transmitting or receiving multiple wirelesstransmissions.

Network communications manager 1545 may manage communications with thecore network (e.g., via one or more wired backhaul links). For example,the network communications manager 1545 may manage the transfer of datacommunications for client devices, such as one or more UEs 115.

Inter-station communications manager 1550 may manage communications withother base station 105, and may include a controller or scheduler forcontrolling communications with UEs 115 in cooperation with other basestations 105. For example, the inter-station communications manager 1550may coordinate scheduling for transmissions to UEs 115 for variousinterference mitigation techniques such as beamforming or jointtransmission. In some examples, inter-station communications manager1550 may provide an X2 interface within an LTE/LTE-A wirelesscommunication network technology to provide communication between basestations 105.

FIG. 16 shows a flowchart illustrating a method 1600 for fallback modefor WUS receivers in accordance with aspects of the present disclosure.The operations of method 1600 may be implemented by a UE 115 or itscomponents as described herein. For example, the operations of method1600 may be performed by a UE communications manager as described withreference to FIGS. 8 through 11. In some examples, a UE 115 may executea set of codes to control the functional elements of the device toperform the functions described herein. Additionally or alternatively,the UE 115 may perform aspects of the functions described herein usingspecial-purpose hardware.

Method 1600 may begin when a UE 115 is in idle mode (e.g., an RRC IDLEstate). At 1605 the UE 115 may receive a configuration of a pagemonitoring periodicity. The operations of 1605 may be performedaccording to the methods described herein. In certain examples, aspectsof the operations of 1605 may be performed by a UE page monitoringcomponent as described with reference to FIGS. 8 through 11. In somecases, receiving the configuration of the page monitoring periodicitymay include identifying time and frequency resources over which theconfiguration is received, demodulating the transmission over theidentified time-frequency resources, and decoding the demodulatedtransmission using a decoder, to obtain one or more bits pertaining tothe configuration.

At 1610 the UE 115 may receive a configuration of a WUS. The operationsof 1610 may be performed according to the methods described herein. Incertain examples, aspects of the operations of 1610 may be performed bya UE wake-up signal component as described with reference to FIGS. 8through 11. In some cases, receiving the WUS may involve identifyingtime and frequency resources over which the configuration is received,demodulating the transmission over the identified time-frequencyresources, and decoding the demodulated transmission using the decoder,to obtain one or more bits pertaining to the configuration.

At 1615 the UE 115 may perform discontinuous monitoring for a pluralityof WUSs based at least in part on a WUS periodicity. For example, theWUS periodicity may be determined based on the WUS configurationreceived at 1610. In some cases, the UE 115 may perform a decodingprocedure to determine the WUS periodicity, and may control one or morefunctional elements (e.g., receiver, or wake-up signal component) tomonitor the WUSs. The operations of 1615 may be performed according tothe methods described herein. In certain examples, aspects of theoperations of 1615 may be performed by a UE wake-up signal component asdescribed with reference to FIGS. 8 through 11.

At 1620 the UE 115 may receive the WUS based at least in part on the WUSperiodicity. In some cases, the UE 115 may control one or more of itsfunctional elements to activate or synchronize prior to the instancewhen the WUS is received, wherein the decision is based in part on a WUSperiodicity determined by the UE 115, or indicated by the network. Theoperations of 1620 may be performed according to the methods describedherein. In certain examples, aspects of the operations of 1620 may beperformed by a receiver as described with reference to FIGS. 8 through11.

At 1625 the UE 115 may monitor for a paging message during a pagemonitoring period according to the page monitoring periodicity, the WUSperiodicity, and the received WUS. Further, the UE 115 may monitor forpaging messages to receive system information updates based on one ormore techniques described with reference to FIGS. 2-6. For instance, theUE 115 may decide which of the techniques to use (e.g., checking MIB,SIB, or the one or more deployment schemes for page monitoringperiodicity without WUS) to receive system information updates. Theoperations of 1625 may be performed according to the methods describedherein. In certain examples, aspects of the operations of 1625 may beperformed by a UE page monitoring component as described with referenceto FIGS. 8 through 11.

FIG. 17 shows a flowchart illustrating a method 1700 for fallback modefor WUS receivers in accordance with aspects of the present disclosure.The operations of method 1700 may be implemented by a UE 115 or itscomponents as described herein. For example, the operations of method1700 may be performed by a UE communications manager as described withreference to FIGS. 8 through 11. In some examples, a UE 115 may executea set of codes to control the functional elements of the device toperform the functions described herein. Additionally or alternatively,the UE 115 may perform aspects of the functions described herein usingspecial-purpose hardware.

At 1705 the UE 115 may receive a configuration of a page monitoringperiodicity. The operations of 1705 may be performed according to themethods described herein. In certain examples, aspects of the operationsof 1705 may be performed by a UE page monitoring component as describedwith reference to FIGS. 8 through 11.

At 1710 the UE 115 may determine that the page monitoring periodicitycomprises one or more POs based on the configuration, wherein the WUSperiodicity corresponds to the one or more POs. For example, the UE 115may identify the decoded one or more bits corresponding to theconfiguration, and may determine the page monitoring periodicity fromthe decoded one or more bits. The operations of 1710 may be performedaccording to the methods described herein. In certain examples, aspectsof the operations of 1710 may be performed by a UE page monitoringcomponent as described with reference to FIGS. 8 through 11.

At 1715 the UE 115 may receive a configuration of a WUS. The operationsof 1715 may be performed according to the methods described herein. Incertain examples, aspects of the operations of 1715 may be performed bya UE wake-up signal component as described with reference to FIGS. 8through 11.

At 1720 the UE 115 may perform discontinuous monitoring for a pluralityof WUSs based at least in part on a WUS periodicity. The operations of1720 may be performed according to the methods described herein. Incertain examples, aspects of the operations of 1720 may be performed bya UE wake-up signal component as described with reference to FIGS. 8through 11.

At 1725 the UE 115 may receive the WUS based at least in part on the WUSperiodicity. The operations of 1725 may be performed according to themethods described herein. In certain examples, aspects of the operationsof 1725 may be performed by a receiver as described with reference toFIGS. 8 through 11.

At 1730 the UE 115 may monitor for a paging message during a pagemonitoring period according to the page monitoring periodicity, the WUSperiodicity, and the received WUS. The operations of 1730 may beperformed according to the methods described herein. In certainexamples, aspects of the operations of 1730 may be performed by a UEpage monitoring component as described with reference to FIGS. 8 through11.

At 1735 the UE 115 may monitor for the paging message according to a POperiodicity and the received WUS. For example, the UE 115 may tune areceiver to monitor for an anticipated paging message based on the POperiodicity and the received WUS. The operations of 1735 may beperformed according to the methods described herein. In certainexamples, aspects of the operations of 1735 may be performed by a UEpage monitoring component as described with reference to FIGS. 8 through11.

FIG. 18 shows a flowchart illustrating a method 1800 for fallback modefor WUS receivers in accordance with aspects of the present disclosure.The operations of method 1800 may be implemented by a UE 115 or itscomponents as described herein. For example, the operations of method1800 may be performed by a UE communications manager as described withreference to FIGS. 8 through 11. In some examples, a UE 115 may executea set of codes to control the functional elements of the device toperform the functions described herein. Additionally or alternatively,the UE 115 may perform aspects of the functions described herein usingspecial-purpose hardware.

At 1805 the UE 115 may receive a configuration of a page monitoringperiodicity. The operations of 1805 may be performed according to themethods described herein. In certain examples, aspects of the operationsof 1805 may be performed by a UE page monitoring component as describedwith reference to FIGS. 8 through 11.

At 1810 the UE 115 may determine that the page monitoring periodicitycomprises one or more RRM measurement periods based at least in part onthe configuration. For example, the UE 115 may identify the decoded oneor more bits corresponding to the configuration, and may determine thepage monitoring periodicity from the decoded one or more bits. Theoperations of 1810 may be performed according to the methods describedherein. In certain examples, aspects of the operations of 1810 may beperformed by a RRM measurement component as described with reference toFIGS. 8 through 11.

At 1815 the UE 115 may receive a configuration of a WUS. The operationsof 1815 may be performed according to the methods described herein. Incertain examples, aspects of the operations of 1815 may be performed bya UE wake-up signal component as described with reference to FIGS. 8through 11.

At 1820 the UE 115 may perform discontinuous monitoring for a pluralityof WUSs based at least in part on a WUS periodicity. The operations of1820 may be performed according to the methods described herein. Incertain examples, aspects of the operations of 1820 may be performed bya UE wake-up signal component as described with reference to FIGS. 8through 11.

At 1825 the UE 115 may receive the WUS based at least in part on the WUSperiodicity. The operations of 1825 may be performed according to themethods described herein. In certain examples, aspects of the operationsof 1825 may be performed by a receiver as described with reference toFIGS. 8 through 11.

At 1830 the UE 115 may monitor for a paging message during a pagemonitoring period according to the page monitoring periodicity, the WUSperiodicity, and the received WUS. The operations of 1830 may beperformed according to the methods described herein. In certainexamples, aspects of the operations of 1830 may be performed by a UEpage monitoring component as described with reference to FIGS. 8 through11.

At 1835 the UE 115 may monitor for the paging message according to anRRM measurement periodicity. For example, the UE 115 may tune a receiverto monitor for an anticipated paging message based on the RRMmeasurement periodicity and the received WUS. The operations of 1835 maybe performed according to the methods described herein. In certainexamples, aspects of the operations of 1835 may be performed by a UEpage monitoring component as described with reference to FIGS. 8 through11.

FIG. 19 shows a flowchart illustrating a method 1900 for fallback modefor WUS receivers in accordance with aspects of the present disclosure.The operations of method 1900 may be implemented by a UE 115 or itscomponents as described herein. For example, the operations of method1900 may be performed by a UE communications manager as described withreference to FIGS. 8 through 11. In some examples, a UE 115 may executea set of codes to control the functional elements of the device toperform the functions described herein. Additionally or alternatively,the UE 115 may perform aspects of the functions described herein usingspecial-purpose hardware.

At 1905 the UE 115 may receive a configuration of a page monitoringperiodicity. The operations of 1905 may be performed according to themethods described herein. In certain examples, aspects of the operationsof 1905 may be performed by a UE page monitoring component as describedwith reference to FIGS. 8 through 11.

At 1910 the UE 115 may determine that the page monitoring periodicitycomprises one or more BCCH modification periods based at least in parton the configuration. For example, the UE 115 may identify the decodedone or more bits corresponding to the configuration, and may determinethe page monitoring periodicity from the decoded one or more bits. Theoperations of 1910 may be performed according to the methods describedherein. In certain examples, aspects of the operations of 1910 may beperformed by a UE broadcast channel component as described withreference to FIGS. 8 through 11.

At 1915 the UE 115 may receive a configuration of a WUS. The operationsof 1915 may be performed according to the methods described herein. Incertain examples, aspects of the operations of 1915 may be performed bya UE wake-up signal component as described with reference to FIGS. 8through 11.

At 1920 the UE 115 may perform discontinuous monitoring for a pluralityof WUSs based at least in part on a WUS periodicity. The operations of1920 may be performed according to the methods described herein. Incertain examples, aspects of the operations of 1920 may be performed bya UE wake-up signal component as described with reference to FIGS. 8through 11.

At 1925 the UE 115 may receive the WUS based at least in part on the WUSperiodicity. The operations of 1925 may be performed according to themethods described herein. In certain examples, aspects of the operationsof 1925 may be performed by a receiver as described with reference toFIGS. 8 through 11.

At 1930 the UE 115 may monitor for a paging message during a pagemonitoring period according to the page monitoring periodicity, the WUSperiodicity, and the received WUS. The operations of 1930 may beperformed according to the methods described herein. In certainexamples, aspects of the operations of 1930 may be performed by a UEpage monitoring component as described with reference to FIGS. 8 through11.

At 1935 the UE 115 may monitor, according to a BCCH modification period,for the paging message, or a system information block, or an MIB, or acombination thereof. For example, the UE 115 may tune a receiver tomonitor for an anticipated paging message based on the BCCH modificationperiod. The operations of 1935 may be performed according to the methodsdescribed herein. In certain examples, aspects of the operations of 1935may be performed by a UE page monitoring component as described withreference to FIGS. 8 through 11.

FIG. 20 shows a flowchart illustrating a method 2000 for fallback modefor WUS receivers in accordance with aspects of the present disclosure.The operations of method 2000 may be implemented by a base station 105or its components as described herein. For example, the operations ofmethod 2000 may be performed by a base station communications manager asdescribed with reference to FIGS. 12 through 15. In some examples, abase station 105 may execute a set of codes to control the functionalelements of the device to perform the functions described herein.Additionally or alternatively, the base station 105 may perform aspectsof the functions described herein using special-purpose hardware.

At 2005, the base station 105 may determine a page monitoringperiodicity for configuring a UE 115 to monitor for a paging message. Insome cases, the determination for page monitoring periodicity may bebased in part on UE capabilities, power considerations, radiotechnologies deployed at the UE 115, or any other parameters, receivedfrom the UE 115 or determined by the network. The operations of 2005 maybe performed according to the methods described herein. In certainexamples, aspects of the operations of 2005 may be performed by a basestation page monitoring component as described with reference to FIGS.12 through 15.

At 2010, the base station 105 may determine a WUS periodicity for aplurality of WUSs, the WUS periodicity being less than or equal to thepage monitoring periodicity. The operations of 2010 may be performedaccording to the methods described herein. In certain examples, aspectsof the operations of 2010 may be performed by a base station wake-upsignal component as described with reference to FIGS. 12 through 15.

At 2015, the base station 105 may transmit a configuration of the pagemonitoring periodicity to the UE, wherein the configuration indicates arelationship between the page monitoring periodicity and the WUSperiodicity. In some cases, the relationship between the page monitoringperiodicity and the WUS periodicity may be dependent on the one or moreparameters described at 1705. The operations of 2015 may be performedaccording to the methods described herein. In certain examples, aspectsof the operations of 2015 may be performed by a transmitter as describedwith reference to FIGS. 12 through 15. In some cases, the configurationof the page monitoring periodicity may be received at the transmitterfrom the base station page monitoring component. In some cases,transmitting the configuration of the page monitoring periodicity to theUE 115 may include identifying time and frequency resources over whichthe configuration is transmitted, obtaining bits for the transmissionfrom the base station page monitoring component, and encoding them priorto transmission. In some cases, the encoding may be performed based on amodulation and coding scheme determined by the base station 105.

FIG. 21 shows a flowchart illustrating a method 2100 for fallback modefor WUS receivers in accordance with aspects of the present disclosure.The operations of method 2100 may be implemented by a UE 115 or itscomponents as described herein. For example, the operations of method2100 may be performed by a UE communications manager as described withreference to FIGS. 8 through 11. In some examples, a UE 115 may executea set of codes to control the functional elements of the device toperform the functions described herein. Additionally or alternatively,the UE 115 may perform aspects of the functions described herein usingspecial-purpose hardware.

At 2105 the UE 115 may receive a configuration of a wake-up signalperiodicity. The operations of 2105 may be performed according to themethods described herein. In certain examples, aspects of the operationsof 2105 may be performed by a UE wake-up signal component as describedwith reference to FIGS. 8 through 11. In some cases, receiving theconfiguration of the wake-up signal periodicity may include identifyingtime and frequency resources over which the configuration is received,demodulating the transmission over the identified time-frequencyresources, and decoding the demodulated transmission using a decoder, toobtain one or more bits pertaining to the configuration.

At 2110 the UE 115 may perform discontinuous monitoring for a pluralityof WUSs based at least in part on a WUS periodicity. For example, theWUS periodicity may be determined based on the WUS configurationreceived at 2105. In some cases, the UE 115 may perform a decodingprocedure to determine the WUS periodicity, and may control one or morefunctional elements (e.g., receiver, or wake-up signal component) tomonitor the WUSs. The operations of 2110 may be performed according tothe methods described herein. In certain examples, aspects of theoperations of 2110 may be performed by a UE wake-up signal component asdescribed with reference to FIGS. 8 through 11.

At 2115 the UE 115 may perform an RRM measurement according to an RRMmeasurement periodicity, wherein the RRM measurement periodicitycorresponds to one or more wake-up signal occasions according to thewake-up signal periodicity. In some cases, the RRM measurementperiodicity may be configured by a base station 105. In some examples,the RRM measurement periodicity may be determined based on RRMmeasurements. The operations of 2115 may be performed according to themethods described herein. In certain examples, aspects of the operationsof 2115 may be performed by an RRM measurement component as describedwith reference to FIGS. 8 through 11.

FIG. 22 shows a flowchart illustrating a method 2200 for fallback modefor WUS receivers in accordance with aspects of the present disclosure.The operations of method 2200 may be implemented by a base station 105or its components as described herein. For example, the operations ofmethod 2200 may be performed by a base station communications manager asdescribed with reference to FIGS. 12 through 15. In some examples, abase station 105 may execute a set of codes to control the functionalelements of the device to perform the functions described herein.Additionally or alternatively, the base station 105 may perform aspectsof the functions described herein using special-purpose hardware.

At 2205, the base station 105 may determine a wake-up signal periodicityfor a plurality of wake-up signals. The operations of 2205 may beperformed according to the methods described herein. In certainexamples, aspects of the operations of 2205 may be performed by a basestation page monitoring component as described with reference to FIGS.12 through 15.

At 2210, the base station 105 may configure, based at least in part onthe wake-up signal periodicity, an RRM measurement periodicity for a UE115 to perform an RRM measurement, wherein the RRM measurementperiodicity corresponds to one or more wake-up signal occasionsaccording to the wake-up signal periodicity. In some cases, the basestation 105 may configure the RRM measurement periodicity based on RRMmeasurements received from the UE 115 (e.g., at an earlier time). Theoperations of 2210 may be performed according to the methods describedherein. In certain examples, aspects of the operations of 2210 may beperformed by an RRM component as described with reference to FIGS. 12through 15.

At 2215, the base station 105 may transmit a configuration indicatingthe RRM measurement periodicity to the UE 115. The operations of 2015may be performed according to the methods described herein. In certainexamples, aspects of the operations of 2215 may be performed by atransmitter as described with reference to FIGS. 12 through 15. In somecases, the configuration may be received at the transmitter from the RRMcomponent. In some cases, transmitting the configuration to the UE 115may include identifying time and frequency resources over which theconfiguration is transmitted, obtaining bits for the transmission fromthe base station page monitoring component, and encoding them prior totransmission. In some cases, the encoding may be performed based on amodulation and coding scheme determined by the base station 105.

It should be noted that the methods described herein describe possibleimplementations, and that the operations and the steps may be rearrangedor otherwise modified and that other implementations are possible.Further, aspects from two or more of the methods may be combined.

Techniques described herein may be used for various wirelesscommunications systems such as code division multiple access (CDMA),time division multiple access (TDMA), frequency division multiple access(FDMA), orthogonal frequency division multiple access (OFDMA), singlecarrier frequency division multiple access (SC-FDMA), and other systems.A CDMA system may implement a radio technology such as CDMA2000,Universal Terrestrial Radio Access (UTRA), etc. CDMA2000 covers IS-2000,IS-95, and IS-856 standards. IS-2000 Releases may be commonly referredto as CDMA2000 1X, 1X, etc. IS-856 (TIA-856) is commonly referred to asCDMA2000 1xEV-DO, High Rate Packet Data (HRPD), etc. UTRA includesWideband CDMA (WCDMA) and other variants of CDMA. A TDMA system mayimplement a radio technology such as Global System for MobileCommunications (GSM).

An OFDMA system may implement a radio technology such as Ultra MobileBroadband (UMB), Evolved UTRA (E-UTRA), Institute of Electrical andElectronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE802.20, Flash-OFDM, etc. UTRA and E-UTRA are part of Universal MobileTelecommunications System (UMTS). LTE and LTE-A are releases of UMTSthat use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, NR, and GSM aredescribed in documents from the organization named “3rd GenerationPartnership Project” (3GPP). CDMA2000 and UMB are described in documentsfrom an organization named “3rd Generation Partnership Project 2”(3GPP2). The techniques described herein may be used for the systems andradio technologies mentioned above as well as other systems and radiotechnologies. While aspects of an LTE or an NR system may be describedfor purposes of example, and LTE or NR terminology may be used in muchof the description, the techniques described herein are applicablebeyond LTE or NR applications.

A macro cell generally covers a relatively large geographic area (e.g.,several kilometers in radius) and may allow unrestricted access by UEs115 with service subscriptions with the network provider. A small cellmay be associated with a lower-powered base station 105, as comparedwith a macro cell, and a small cell may operate in the same or different(e.g., licensed, unlicensed, etc.) frequency bands as macro cells. Smallcells may include pico cells, femto cells, and micro cells according tovarious examples. A pico cell, for example, may cover a small geographicarea and may allow unrestricted access by UEs 115 with servicesubscriptions with the network provider. A femto cell may also cover asmall geographic area (e.g., a home) and may provide restricted accessby UEs 115 having an association with the femto cell (e.g., UEs 115 in aclosed subscriber group (CSG), UEs 115 for users in the home, and thelike). An eNB for a macro cell may be referred to as a macro eNB. An eNBfor a small cell may be referred to as a small cell eNB, a pico eNB, afemto eNB, or a home eNB. An eNB may support one or multiple (e.g., two,three, four, and the like) cells, and may also support communicationsusing one or multiple component carriers.

The wireless communications system 100 or systems described herein maysupport synchronous or asynchronous operation. For synchronousoperation, the base stations 105 may have similar frame timing, andtransmissions from different base stations 105 may be approximatelyaligned in time. For asynchronous operation, the base stations 105 mayhave different frame timing, and transmissions from different basestations 105 may not be aligned in time. The techniques described hereinmay be used for either synchronous or asynchronous operations.

Information and signals described herein may be represented using any ofa variety of different technologies and techniques. For example, data,instructions, commands, information, signals, bits, symbols, and chipsthat may be referenced throughout the above description may berepresented by voltages, currents, electromagnetic waves, magneticfields or particles, optical fields or particles, or any combinationthereof.

The various illustrative blocks and modules described in connection withthe disclosure herein may be implemented or performed with ageneral-purpose processor, a digital signal processor (DSP), anapplication-specific integrated circuit (ASIC), a field-programmablegate array (FPGA) or other programmable logic device (PLD), discretegate or transistor logic, discrete hardware components, or anycombination thereof designed to perform the functions described herein.A general-purpose processor may be a microprocessor, but in thealternative, the processor may be any conventional processor,controller, microcontroller, or state machine. A processor may also beimplemented as a combination of computing devices (e.g., a combinationof a DSP and a microprocessor, multiple microprocessors, one or moremicroprocessors in conjunction with a DSP core, or any other suchconfiguration).

The functions described herein may be implemented in hardware, softwareexecuted by a processor, firmware, or any combination thereof. Ifimplemented in software executed by a processor, the functions may bestored on or transmitted over as one or more instructions or code on acomputer-readable medium. Other examples and implementations are withinthe scope of the disclosure and appended claims. For example, due to thenature of software, functions described herein can be implemented usingsoftware executed by a processor, hardware, firmware, hardwiring, orcombinations of any of these. Features implementing functions may alsobe physically located at various positions, including being distributedsuch that portions of functions are implemented at different physicallocations.

Computer-readable media includes both non-transitory computer storagemedia and communication media including any medium that facilitatestransfer of a computer program from one place to another. Anon-transitory storage medium may be any available medium that can beaccessed by a general purpose or special purpose computer. By way ofexample, and not limitation, non-transitory computer-readable media maycomprise random-access memory (RAM), read-only memory (ROM),electrically erasable programmable read only memory (EEPROM), flashmemory, compact disk (CD) ROM or other optical disk storage, magneticdisk storage or other magnetic storage devices, or any othernon-transitory medium that can be used to carry or store desired programcode means in the form of instructions or data structures and that canbe accessed by a general-purpose or special-purpose computer, or ageneral-purpose or special-purpose processor. Also, any connection isproperly termed a computer-readable medium. For example, if the softwareis transmitted from a website, server, or other remote source using acoaxial cable, fiber optic cable, twisted pair, digital subscriber line(DSL), or wireless technologies such as infrared, radio, and microwave,then the coaxial cable, fiber optic cable, twisted pair, DSL, orwireless technologies such as infrared, radio, and microwave areincluded in the definition of medium. Disk and disc, as used herein,include CD, laser disc, optical disc, digital versatile disc (DVD),floppy disk and Blu-ray disc where disks usually reproduce datamagnetically, while discs reproduce data optically with lasers.Combinations of the above are also included within the scope ofcomputer-readable media.

As used herein, including in the claims, “or” as used in a list of items(e.g., a list of items prefaced by a phrase such as “at least one of” or“one or more of”) indicates an inclusive list such that, for example, alist of at least one of A, B, or C means A or B or C or AB or AC or BCor ABC (i.e., A and B and C). Also, as used herein, the phrase “basedon” shall not be construed as a reference to a closed set of conditions.For example, an exemplary step that is described as “based on conditionA” may be based on both a condition A and a condition B withoutdeparting from the scope of the present disclosure. In other words, asused herein, the phrase “based on” shall be construed in the same manneras the phrase “based at least in part on.”

In the appended figures, similar components or features may have thesame reference label. Further, various components of the same type maybe distinguished by following the reference label by a dash and a secondlabel that distinguishes among the similar components. If just the firstreference label is used in the specification, the description isapplicable to any one of the similar components having the same firstreference label irrespective of the second reference label, or othersubsequent reference label.

The description set forth herein, in connection with the appendeddrawings, describes example configurations and does not represent allthe examples that may be implemented or that are within the scope of theclaims. The term “exemplary” used herein means “serving as an example,instance, or illustration,” and not “preferred” or “advantageous overother examples.” The detailed description includes specific details forthe purpose of providing an understanding of the described techniques.These techniques, however, may be practiced without these specificdetails. In some instances, well-known structures and devices are shownin block diagram form in order to avoid obscuring the concepts of thedescribed examples.

The description herein is provided to enable a person skilled in the artto make or use the disclosure. Various modifications to the disclosurewill be readily apparent to those skilled in the art, and the genericprinciples defined herein may be applied to other variations withoutdeparting from the scope of the disclosure. Thus, the disclosure is notlimited to the examples and designs described herein, but is to beaccorded the broadest scope consistent with the principles and novelfeatures disclosed herein.

What is claimed is:
 1. A method for wireless communication at a userequipment (UE), comprising: receiving a configuration of a pagemonitoring periodicity; receiving a configuration of a wake-up signal;performing discontinuous monitoring for a plurality of wake-up signalsbased at least in part on a wake-up signal periodicity; and monitoringfor a paging message during a page monitoring period according to thepage monitoring periodicity, or the wake-up signal periodicity, or areceived wake-up signal, or a combination thereof.
 2. The method ofclaim 1, further comprising: receiving the wake-up signal based at leastin part on the wake-up signal periodicity.
 3. The method of claim 1,further comprising: determining that the page monitoring periodicitycomprises one or more paging occasions (POs) based on the configuration,wherein the wake-up signal periodicity corresponds to the one or morePOs; and monitoring for the paging message according to a PO periodicityor the received wake-up signal, or a combination thereof.
 4. The methodof claim 1, further comprising: determining that the page monitoringperiodicity comprises one or more wake-up signal occasions based atleast in part on the configuration, wherein the wake-up signalperiodicity corresponds to a paging time window (PTW) periodicity thatincludes one or more paging occasions (POs); and monitoring for thepaging message according to the PTW periodicity or the received wake-upsignal, or a combination thereof.
 5. The method of claim 1, furthercomprising: determining that the page monitoring periodicity comprisesone or more wake-up signal occasions based at least in part on theconfiguration, wherein the wake-up signal periodicity corresponds to oneor more paging occasions (POs); and monitoring for the paging messageaccording to the one or more POs or the received wake-up signal, or acombination thereof.
 6. The method of claim 1, further comprising:determining that the page monitoring periodicity comprises one or moreradio resource management (RRM) measurement periods based at least inpart on the configuration; and monitoring for the paging messageaccording to an RRM measurement periodicity.
 7. The method of claim 1,further comprising: determining that the page monitoring periodicitycomprises one or more broadcast control channel (BCCH) modificationperiods based at least in part on the configuration; and monitoring,according to a BCCH modification period, for the paging message, or asystem information block, or a master information block (MIB), or acombination thereof.
 8. The method of claim 1, wherein receiving theconfiguration of the page monitoring periodicity comprises: receivingthe configuration of the page monitoring periodicity via a systeminformation message, or a radio resource control (RRC) message, or anon-access stratum (NAS) message, or a combination thereof.
 9. Themethod of claim 1, further comprising: identifying the configuration ofthe page monitoring periodicity based at least in part on a time periodduring which the wake-up signal has been skipped at least once.
 10. Themethod of claim 1, further comprising: identifying the configuration ofthe page monitoring periodicity based at least in part on a relationshipbetween the page monitoring periodicity and one or more otherparameters.
 11. The method of claim 1, further comprising: detecting thepaging message during the page monitoring period based at least in parton the monitoring, wherein the paging message is detected based at leastin part on the received wake-up signal.
 12. The method of claim 1,further comprising: performing a handover to a target cell; andmonitoring for one or more paging messages from the target cellaccording to a page monitoring periodicity for the target cell, or awake-up signal periodicity for the target cell, or a received wake-upsignal from the target cell, or a combination thereof.
 13. The method ofclaim 1, further comprising: identifying a system information changenotification based at least in part on a detected paging message.
 14. Amethod for wireless communication at a base station, comprising:determining a page monitoring periodicity for configuring a userequipment (UE) to monitor for a paging message; determining a wake-upsignal periodicity for a plurality of wake-up signals, the wake-upsignal periodicity being less than or equal to the page monitoringperiodicity; and transmitting a configuration of the page monitoringperiodicity to the UE, wherein the configuration indicates arelationship between the page monitoring periodicity and the wake-upsignal periodicity.
 15. The method of claim 14, further comprising:transmitting, within the configuration, an indication that the pagemonitoring periodicity comprises one or more paging occasions (POs),wherein the wake-up signal periodicity corresponds to the one or morePOs.
 16. The method of claim 14, further comprising: transmitting,within the configuration, an indication that the page monitoringperiodicity comprises one or more wake-up signal occasions, wherein thewake-up signal periodicity corresponds to a paging time window (PTW)periodicity that includes one or more paging occasions (POs).
 17. Themethod of claim 14, further comprising: transmitting, within theconfiguration, an indication that the page monitoring periodicitycomprises one or more wake-up signal occasions based at least in part onthe configuration, wherein the wake-up signal periodicity corresponds toone or more paging occasions (POs).
 18. The method of claim 14, furthercomprising: transmitting, within the configuration, an indication thatthe page monitoring periodicity comprises one or more radio resourcemanagement (RRM) measurement periods.
 19. The method of claim 14,further comprising: transmitting, within the configuration, anindication that the page monitoring periodicity comprises one or morebroadcast control channel (BCCH) modification periods.
 20. The method ofclaim 14, wherein transmitting the configuration of the page monitoringperiodicity comprises: transmitting the configuration of the pagemonitoring periodicity via a system information message, or a radioresource control (RRC) message, or a non-access stratum (NAS) message,or a combination thereof.
 21. The method of claim 14, furthercomprising: transmitting a system information change notification withinthe paging message.
 22. An apparatus for wireless communication,comprising: a receiver configured to receive a configuration of a pagemonitoring periodicity and receive a configuration of a wake-up signal;a processor; memory in electronic communication with the processor; andinstructions stored in the memory and executable by the processor tocause the apparatus to: perform discontinuous monitoring for a pluralityof wake-up signals based at least in part on a wake-up signalperiodicity; and monitor for a paging message during a page monitoringperiod according to the page monitoring periodicity, or the wake-upsignal periodicity, or a received wake-up signal, or a combinationthereof.
 23. The apparatus of claim 22, wherein the receiver isconfigured to: receive the wake-up signal based at least in part on thewake-up signal periodicity.
 24. The apparatus of claim 22, wherein theinstructions are further executable by the processor to cause theapparatus to: determine that the page monitoring periodicity comprisesone or more paging occasions (POs) based on the configuration, whereinthe wake-up signal periodicity corresponds to the one or more POs; andmonitor for the paging message according to a PO periodicity or thereceived wake-up signal, or a combination thereof.
 25. The apparatus ofclaim 22, wherein the instructions are further executable by theprocessor to cause the apparatus to: determine that the page monitoringperiodicity comprises one or more wake-up signal occasions based atleast in part on the configuration, wherein the wake-up signalperiodicity corresponds to a paging time window (PTW) periodicity thatincludes one or more paging occasions (POs); and monitor for the pagingmessage according to the PTW periodicity or the received wake-up signal,or a combination thereof.
 26. The apparatus of claim 22, wherein theinstructions are further executable by the processor to cause theapparatus to: determine that the page monitoring periodicity comprisesone or more wake-up signal occasions based at least in part on theconfiguration, wherein the wake-up signal periodicity corresponds to oneor more paging occasions (POs); and monitor for the paging messageaccording to the one or more POs or the received wake-up signal, or acombination thereof.
 27. The apparatus of claim 22, wherein theinstructions are further executable by the processor to cause theapparatus to: determine that the page monitoring periodicity comprisesone or more radio resource management (RRM) measurement periods based atleast in part on the configuration; and monitor for the paging messageaccording to an RRM measurement periodicity.
 28. The apparatus of claim22, wherein the instructions are further executable by the processor tocause the apparatus to: determine that the page monitoring periodicitycomprises one or more broadcast control channel (BCCH) modificationperiods based at least in part on the configuration; and monitor,according to a BCCH modification period, for the paging message, or asystem information block, or a master information block (MIB), or acombination thereof.
 29. The apparatus of claim 22, wherein the receiveris configured to: receive the configuration of the page monitoringperiodicity via a system information message, or a radio resourcecontrol (RRC) message, or a non-access stratum (NAS) message, or acombination thereof.
 30. The apparatus of claim 22, wherein theinstructions are further executable by the processor to cause theapparatus to: identify the configuration of the page monitoringperiodicity based at least in part on a time period during which thewake-up signal has been skipped at least once.
 31. The apparatus ofclaim 22, wherein the instructions are further executable by theprocessor to cause the apparatus to: identify the configuration of thepage monitoring periodicity based at least in part on a relationshipbetween the page monitoring periodicity and one or more otherparameters.
 32. The apparatus of claim 22, wherein the instructions arefurther executable by the processor to cause the apparatus to: detectthe paging message during the page monitoring period based at least inpart on the monitoring, wherein the paging message is detected based atleast in part on the received wake-up signal.
 33. The apparatus of claim22, wherein the instructions are further executable by the processor tocause the apparatus to: perform a handover to a target cell; and monitorfor one or more paging messages from the target cell according to a pagemonitoring periodicity for the target cell, or a wake-up signalperiodicity for the target cell, or a received wake-up signal from thetarget cell, or a combination thereof.
 34. The apparatus of claim 22,wherein the instructions are further executable by the processor tocause the apparatus to: identify a system information changenotification based at least in part on a detected paging message.
 35. Anapparatus for wireless communication, comprising: a processor; memory inelectronic communication with the processor; instructions stored in thememory and executable by the processor to cause the apparatus to:determine a page monitoring periodicity for configuring a user equipment(UE) to monitor for a paging message; and determine a wake-up signalperiodicity for a plurality of wake-up signals, the wake-up signalperiodicity being less than or equal to the page monitoring periodicity;and a transmitter configured to transmit a configuration of the pagemonitoring periodicity to the UE, wherein the configuration indicates arelationship between the page monitoring periodicity and the wake-upsignal periodicity.
 36. The apparatus of claim 35, wherein thetransmitter is configured to: transmit, within the configuration, anindication that the page monitoring periodicity comprises one or morepaging occasions (POs), wherein the wake-up signal periodicitycorresponds to the one or more POs.
 37. The apparatus of claim 35,wherein the transmitter is configured to: transmit, within theconfiguration, an indication that the page monitoring periodicitycomprises one or more wake-up signal occasions, wherein the wake-upsignal periodicity corresponds to a paging time window (PTW) periodicitythat includes one or more paging occasions (POs).
 38. The apparatus ofclaim 35, wherein the transmitter is configured to: transmit, within theconfiguration, an indication that the page monitoring periodicitycomprises one or more wake-up signal occasions based at least in part onthe configuration, wherein the wake-up signal periodicity corresponds toone or more paging occasions (POs).
 39. The apparatus of claim 35,wherein the transmitter I configured to: transmit, within theconfiguration, an indication that the page monitoring periodicitycomprises one or more broadcast control channel (BCCH) modificationperiods.
 40. The apparatus of claim 35, wherein the transmitter isconfigured to: transmit the configuration of the page monitoringperiodicity via a system information message, or a radio resourcecontrol (RRC) message, or a non-access stratum (NAS) message, or acombination thereof.
 41. The apparatus of claim 35, wherein thetransmitter is configured to: transmit a system information changenotification within the paging message.
 42. An apparatus for wirelesscommunication, comprising: means for receiving a configuration of a pagemonitoring periodicity; means for receiving a configuration of a wake-upsignal; means for performing discontinuous monitoring for a plurality ofwake-up signals based at least in part on a wake-up signal periodicity;and means for monitoring for a paging message during a page monitoringperiod according to the page monitoring periodicity, or the wake-upsignal periodicity, or a received wake-up signal, or a combinationthereof.
 43. An apparatus for wireless communication, comprising: meansfor determining a page monitoring periodicity for configuring a userequipment (UE) to monitor for a paging message; means for determining awake-up signal periodicity for a plurality of wake-up signals, thewake-up signal periodicity being less than or equal to the pagemonitoring periodicity; and means for transmitting a configuration ofthe page monitoring periodicity to the UE, wherein the configurationindicates a relationship between the page monitoring periodicity and thewake-up signal periodicity.
 44. A non-transitory computer-readablemedium storing code for wireless communication, the code comprisinginstructions executable by a processor to: receive a configuration of apage monitoring periodicity; receive a configuration of a wake-upsignal; perform discontinuous monitoring for a plurality of wake-upsignals based at least in part on a wake-up signal periodicity; andmonitor for a paging message during a page monitoring period accordingto the page monitoring periodicity, or the wake-up signal periodicity,or a received wake-up signal, or a combination thereof.
 45. Anon-transitory computer-readable medium storing code for wirelesscommunication, the code comprising instructions executable by aprocessor to: determine a page monitoring periodicity for configuring auser equipment (UE) to monitor for a paging message; determine a wake-upsignal periodicity for a plurality of wake-up signals, the wake-upsignal periodicity being less than or equal to the page monitoringperiodicity; and transmit a configuration of the page monitoringperiodicity to the UE, wherein the configuration indicates arelationship between the page monitoring periodicity and the wake-upsignal periodicity.